WIP: Mr origin 26740

What does this MR do?

Local copy of community contribution !26740 (merged)

This is a suggested approach for unblocking the linked community contribution. The original issue was that searching by releases on the group page did not work. Upon investigation it was determined that there was no controller.

This code extends the original contribution to support:

• abstraction of logic into a Finder
• paging
• testing for N+1 conditions
• support for finding releases under nested groups

Currently releases cannot be directly attached to groups, so this MR takes the approach that for a group we will search for any releases attached to projects under those groups (& subgroups).

Separately, there is an effort underway to attach releases directly to groups.

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team