Update structure.sql to remove an index

This index was removed with
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/150728.

See
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/150728#note_1890789185
for more details.

[skip-db-structure-check]

db/structure.sql

@@ -24907,8 +24907,6 @@ CREATE INDEX p_ci_job_artifacts_partition_id_job_id_idx ON ONLY p_ci_job_artifac
 CREATE INDEX index_ci_job_artifacts_on_partition_id_job_id ON ci_job_artifacts USING btree (partition_id, job_id);
-CREATE INDEX index_ci_job_artifacts_on_project_id ON ci_job_artifacts USING btree (project_id);
-
 CREATE INDEX p_ci_job_artifacts_project_id_id_idx1 ON ONLY p_ci_job_artifacts USING btree (project_id, id);
 CREATE INDEX index_ci_job_artifacts_on_project_id_and_id ON ci_job_artifacts USING btree (project_id, id);

spec/support/helpers/database/duplicate_indexes.yml

@@ -21,13 +21,6 @@ boards_epic_board_recent_visits:
 boards_epic_user_preferences:
   index_boards_epic_user_preferences_on_board_user_epic_unique:
     - index_boards_epic_user_preferences_on_board_id
-ci_job_artifacts:
-  index_ci_job_artifacts_on_id_project_id_and_created_at:
-    - index_ci_job_artifacts_on_project_id
-  index_ci_job_artifacts_on_id_project_id_and_file_type:
-    - index_ci_job_artifacts_on_project_id
-  index_ci_job_artifacts_on_project_id_and_id:
-    - index_ci_job_artifacts_on_project_id
 ci_stages:
   index_ci_stages_on_pipeline_id_and_position:
     - index_ci_stages_on_pipeline_id