Add desired sharding keys for vulnerability_management

Add desired sharding keys for feature category `vulnerability_management`.

These tables have been identified as a [cell local tables](https://docs.gitlab.com/ee/development/database/multiple_databases.html#guidelines-on-choosing-between-gitlab_main_cell-and-gitlab_main_clusterwide-schema).
All cell local tables require a [sharding key](https://docs.gitlab.com/ee/development/database/multiple_databases.html#defining-a-sharding-key-for-all-cell-local-tables)
or a [desired sharding key](https://docs.gitlab.com/ee/development/database/multiple_databases.html#defining-a-desired_sharding_key-for-automatically-backfilling-a-sharding_key)

A desired sharding key has been automatically selected for these tables.
These keys were chosen as the desired sharding keys because the
table has a :belongs_to relationship to a table that itself has a `NOT NULL` sharding key.

Additionally, `gitlab_schema` has been set to `gitlab_main_cell` for any tables didn't use this schema already.
For these tables we have also added `allow_cross_joins`, `allow_cross_transactions` and
`allow_cross_foreign_keys`. These will silence any existing violations, allowing the pipeline to pass without
requiring further changes. In the future, we'll remove these `allow_...` statements and fix any violations as
they arise. You can read more about this in the [documentation for multiple databases](https://docs.gitlab.com/ee/development/database/multiple_databases.html)

We have assigned a random backend engineer from ~"group::threat insights" to review these changes.

Please confirm that:

- each of these tables can be classified as cell local
- the selected desired sharding key is appropriate
- the backfill configuration for the desired sharding key is correct

When you are finished, please request a review from the database maintainer suggested by Danger.
If you have any questions or concerns, reach out to @tigerwnz, @DylanGriffith or @manojmj.

If you would like to go through similar merged MRs so as to gather an understanding on this topic, you
can use [this](https://gitlab.com/gitlab-org/gitlab/-/merge_requests?scope=all&state=merged&label_name[]=automation%3Agitlab-housekeeper-authored) link.

This change was generated by
[gitlab-housekeeper](https://gitlab.com/gitlab-org/gitlab/-/tree/master/gems/gitlab-housekeeper)

Changelog: other

db/docs/vulnerability_external_issue_links.yml

@@ -4,7 +4,23 @@ classes:
 - Vulnerabilities::ExternalIssueLink
 feature_categories:
 - vulnerability_management
-description: Stores information about connections between external issue trackers and vulnerabilities
+description: Stores information about connections between external issue trackers
+  and vulnerabilities
 introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/48465
 milestone: '13.7'
-gitlab_schema: gitlab_main
+gitlab_schema: gitlab_main_cell
+allow_cross_joins:
+- gitlab_main_clusterwide
+allow_cross_transactions:
+- gitlab_main_clusterwide
+allow_cross_foreign_keys:
+- gitlab_main_clusterwide
+desired_sharding_key:
+  project_id:
+    references: projects
+    backfill_via:
+      parent:
+        foreign_key: vulnerability_id
+        table: vulnerabilities
+        sharding_key: project_id
+        belongs_to: vulnerability

db/docs/vulnerability_finding_evidences.yml

@@ -7,4 +7,19 @@ feature_categories:
 description: Stores evidence used to identify presence of a vulnerability
 introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/56790
 milestone: '13.11'
-gitlab_schema: gitlab_main
+gitlab_schema: gitlab_main_cell
+allow_cross_joins:
+- gitlab_main_clusterwide
+allow_cross_transactions:
+- gitlab_main_clusterwide
+allow_cross_foreign_keys:
+- gitlab_main_clusterwide
+desired_sharding_key:
+  project_id:
+    references: projects
+    backfill_via:
+      parent:
+        foreign_key: vulnerability_occurrence_id
+        table: vulnerability_occurrences
+        sharding_key: project_id
+        belongs_to: finding

db/docs/vulnerability_finding_links.yml

@@ -7,4 +7,19 @@ feature_categories:
 description: Stores URLs relevant to the vulnerability findings
 introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/46555
 milestone: '13.6'
-gitlab_schema: gitlab_main
+gitlab_schema: gitlab_main_cell
+allow_cross_joins:
+- gitlab_main_clusterwide
+allow_cross_transactions:
+- gitlab_main_clusterwide
+allow_cross_foreign_keys:
+- gitlab_main_clusterwide
+desired_sharding_key:
+  project_id:
+    references: projects
+    backfill_via:
+      parent:
+        foreign_key: vulnerability_occurrence_id
+        table: vulnerability_occurrences
+        sharding_key: project_id
+        belongs_to: finding

db/docs/vulnerability_finding_signatures.yml

@@ -4,7 +4,23 @@ classes:
 - Vulnerabilities::FindingSignature
 feature_categories:
 - vulnerability_management
-description: Stores signatures of vulnerability locations which are used to improve tracking
+description: Stores signatures of vulnerability locations which are used to improve
+  tracking
 introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/57840
 milestone: '13.11'
-gitlab_schema: gitlab_main
+gitlab_schema: gitlab_main_cell
+allow_cross_joins:
+- gitlab_main_clusterwide
+allow_cross_transactions:
+- gitlab_main_clusterwide
+allow_cross_foreign_keys:
+- gitlab_main_clusterwide
+desired_sharding_key:
+  project_id:
+    references: projects
+    backfill_via:
+      parent:
+        foreign_key: finding_id
+        table: vulnerability_occurrences
+        sharding_key: project_id
+        belongs_to: finding

db/docs/vulnerability_flags.yml

@@ -4,7 +4,23 @@ classes:
 - Vulnerabilities::Flag
 feature_categories:
 - vulnerability_management
-description: Stores additional information for vulnerabilities, for example if a vulnerability is identified as a false positive
+description: Stores additional information for vulnerabilities, for example if a vulnerability
+  is identified as a false positive
 introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/65573
 milestone: '14.1'
-gitlab_schema: gitlab_main
+gitlab_schema: gitlab_main_cell
+allow_cross_joins:
+- gitlab_main_clusterwide
+allow_cross_transactions:
+- gitlab_main_clusterwide
+allow_cross_foreign_keys:
+- gitlab_main_clusterwide
+desired_sharding_key:
+  project_id:
+    references: projects
+    backfill_via:
+      parent:
+        foreign_key: vulnerability_occurrence_id
+        table: vulnerability_occurrences
+        sharding_key: project_id
+        belongs_to: finding

db/docs/vulnerability_issue_links.yml

@@ -7,4 +7,19 @@ feature_categories:
 description: Join table between Vulnerabilities and Issues
 introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/19852
 milestone: '12.5'
-gitlab_schema: gitlab_main
+gitlab_schema: gitlab_main_cell
+allow_cross_joins:
+- gitlab_main_clusterwide
+allow_cross_transactions:
+- gitlab_main_clusterwide
+allow_cross_foreign_keys:
+- gitlab_main_clusterwide
+desired_sharding_key:
+  project_id:
+    references: projects
+    backfill_via:
+      parent:
+        foreign_key: vulnerability_id
+        table: vulnerabilities
+        sharding_key: project_id
+        belongs_to: vulnerability

db/docs/vulnerability_merge_request_links.yml

@@ -7,4 +7,19 @@ feature_categories:
 description: Join table between Vulnerabilities and Merge Requests
 introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/92096
 milestone: '15.2'
-gitlab_schema: gitlab_main
+gitlab_schema: gitlab_main_cell
+allow_cross_joins:
+- gitlab_main_clusterwide
+allow_cross_transactions:
+- gitlab_main_clusterwide
+allow_cross_foreign_keys:
+- gitlab_main_clusterwide
+desired_sharding_key:
+  project_id:
+    references: projects
+    backfill_via:
+      parent:
+        foreign_key: vulnerability_id
+        table: vulnerabilities
+        sharding_key: project_id
+        belongs_to: vulnerability

db/docs/vulnerability_occurrence_identifiers.yml

@@ -7,4 +7,19 @@ feature_categories:
 description: Join table between Findings and Identifiers
 introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/6896
 milestone: '11.4'
-gitlab_schema: gitlab_main
+gitlab_schema: gitlab_main_cell
+allow_cross_joins:
+- gitlab_main_clusterwide
+allow_cross_transactions:
+- gitlab_main_clusterwide
+allow_cross_foreign_keys:
+- gitlab_main_clusterwide
+desired_sharding_key:
+  project_id:
+    references: projects
+    backfill_via:
+      parent:
+        foreign_key: occurrence_id
+        table: vulnerability_occurrences
+        sharding_key: project_id
+        belongs_to: finding

db/docs/vulnerability_occurrence_pipelines.yml

@@ -7,4 +7,19 @@ feature_categories:
 description: Join table between Findings and Pipelines
 introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/7578
 milestone: '11.5'
-gitlab_schema: gitlab_main
+gitlab_schema: gitlab_main_cell
+allow_cross_joins:
+- gitlab_main_clusterwide
+allow_cross_transactions:
+- gitlab_main_clusterwide
+allow_cross_foreign_keys:
+- gitlab_main_clusterwide
+desired_sharding_key:
+  project_id:
+    references: projects
+    backfill_via:
+      parent:
+        foreign_key: occurrence_id
+        table: vulnerability_occurrences
+        sharding_key: project_id
+        belongs_to: finding

db/docs/vulnerability_state_transitions.yml

@@ -7,4 +7,19 @@ feature_categories:
 description: Stores state transitions of a Vulnerability
 introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/87957
 milestone: '15.1'
-gitlab_schema: gitlab_main
+gitlab_schema: gitlab_main_cell
+allow_cross_joins:
+- gitlab_main_clusterwide
+allow_cross_transactions:
+- gitlab_main_clusterwide
+allow_cross_foreign_keys:
+- gitlab_main_clusterwide
+desired_sharding_key:
+  project_id:
+    references: projects
+    backfill_via:
+      parent:
+        foreign_key: vulnerability_id
+        table: vulnerabilities
+        sharding_key: project_id
+        belongs_to: vulnerability

db/docs/vulnerability_user_mentions.yml

@@ -7,4 +7,19 @@ feature_categories:
 description: Stores notes for a given vulnerability
 introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/27515
 milestone: '13.0'
-gitlab_schema: gitlab_main
+gitlab_schema: gitlab_main_cell
+allow_cross_joins:
+- gitlab_main_clusterwide
+allow_cross_transactions:
+- gitlab_main_clusterwide
+allow_cross_foreign_keys:
+- gitlab_main_clusterwide
+desired_sharding_key:
+  project_id:
+    references: projects
+    backfill_via:
+      parent:
+        foreign_key: vulnerability_id
+        table: vulnerabilities
+        sharding_key: project_id
+        belongs_to: vulnerability