Add note about rebase/squash duplication in Gitaly
What does this MR do?
Adds a duplication note for some code we copied into Gitaly-Go.
Why was this MR needed?
So no one changes it without doing the appropriate changes in Gitaly.
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
API support added -
Tests added for this feature/bug - Review
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Has been reviewed by UX -
Has been reviewed by Frontend -
Has been reviewed by Backend -
Has been reviewed by Database
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Conform by the merge request performance guides -
Conform by the style guides -
Squashed related commits together -
Internationalization required/considered -
End-to-end tests pass ( package-and-qamanual pipeline job)