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This introduces a comprehensive migration framework for Active Context
and adds collection management capabilities through database-specific executors.
These changes enable systematic database schema management and provide a unified
way to create and manage collections across different database backends.

Key changes:
- Introduce migration framework with version tracking and batch operation support
- Add database-specific executors for managing collections (PostgreSQL, Elasticsearch, OpenSearch)
- Implement partition strategy for handling sharded collections
- Move prefix configuration from Client to Adapter level
- Add migrations path configuration support

Technical details:
- Add Migration base class with versioning support (V1_0)
- Implement BatchOperationResult for tracking long-running operations
- Add collection creation with field type support (bigint, prefix, vector)
- Add partition management with naming strategy
- Add support for creating indices on fields based on database capabilities
- Implement database-specific collection creation logic:
  * PostgreSQL: Partitioned tables with vector support
  * Elasticsearch: Index templates and aliases
  * OpenSearch: Base executor structure (implementation pending)

The migration framework follows a similar pattern to ActiveRecord migrations,
with timestamped migration files and version tracking. Collections can be
created with specific field types and indexing options, which are translated
to the appropriate database-specific implementations.

Migration files should be placed in ee/db/active_context/migrate/ by default,
but this path can be configured through ActiveContext::Config.

We will log response sizes over the GITLAB_LOG_DECOMPRESSED_RESPONSE_BYTESIZE if set

At
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/180120#note_2329196621
it was mentioned that it's difficult to track down exactly where
housekeeper is running. Adding links to the README might help others in
future locating this information.

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Implement a comprehensive Elasticsearch query processor that transforms
ActiveContext::Query AST nodes into Elasticsearch DSL queries. This
implementation provides proper handling of all query types and follows
best practices for query composition.

Key changes:
- Add Processor class with support for filter, prefix, knn, and boolean queries
- Implement helper methods for consistent query building
- Add comprehensive test coverage
- Add YARD documentation for all methods

Details:
* Processor changes:
  - Implement transform method following concern contract
  - Add build_bool_query helper for consistent query construction
  - Add proper handling of KNN queries with other conditions
  - Implement proper query composition for nested structures

* Test improvements:
  - Add comprehensive test suite with all query types
  - Add test cases for complex nested queries
  - Add edge case coverage
  - Use shared examples for common query patterns

* Documentation:
  - Add YARD documentation for all public methods
  - Add usage examples
  - Document query composition patterns
  - Add type specifications for parameters

This implementation provides a production-ready solution for transforming
query AST nodes into Elasticsearch queries, with proper handling of all
supported query types and edge cases.

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# Conflicts:
#	gems/gitlab-active-context/spec/spec_helper.rb

This reverts commit a1dda13d, reversing
changes made to b10a664e.

We decided to move away from the OpenAPI generated client and just use
Faraday directly.

This reverts merge request !175947

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# Conflicts:
#	gems/gitlab-active-context/lib/active_context/databases/concerns/client.rb
#	gems/gitlab-active-context/lib/active_context/databases/elasticsearch/client.rb
#	gems/gitlab-active-context/spec/lib/active_context/databases/elasticsearch/client_spec.rb

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re2 v2.4 doesn't support Ruby 3.3 as a precompiled gem. Bump the
version to the same version that GitLab uses.

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This update fixes CVE-2024-54133. We are not vulnerable to it
at the moment but this prevents a regression in the future.

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Co-authored-by: Ravi Kumar <rkumar@gitlab.com>

Apply updates to Net::HTTP#connect patch to include support for TLS on
connection proxies added with 0.5.0

Co-authored-by: Ravi Kumar <rkumar@gitlab.com>

Changelog: changed

Co-authored-by: Madelein van Niekerk <mvanniekerk@gitlab.com>

Moves the `Gitlab/DocUrl` cop to the
`Gitlab/DocumentationLinks/HardcodedUrl` namespace.

We need to pass custom message to `super` instead of overriding `#message`