Migrate compare_source_branch to use only Gitaly
What does this MR do?
Migrates another method to Gitaly, through a client side only migration.
Does this MR meet the acceptance criteria?
-
Changelog entry added, if necessary -
Documentation created/updated -
API support added -
Tests added for this feature/bug - Conform by the code review guidelines
-
Has been reviewed by a UX Designer -
Has been reviewed by a Frontend maintainer -
Has been reviewed by a Backend maintainer -
Has been reviewed by a Database specialist
-
-
Conform by the merge request performance guides -
Conform by the style guides -
If you have multiple commits, please combine them into a few logically organized commits by squashing them -
Internationalization required/considered -
End-to-end tests pass ( package-and-qamanual pipeline job)