Add rugged_is_ancestor method
What does this MR do?
Add Gitlab::Git::Repository#rugged_is_ancestor? which bypasses Gitaly.
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
For gitlab-ee, see https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/2566.
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
API support added - Tests
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Added for this feature/bug -
All builds are passing
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- 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 -
Branch has no merge conflicts with master(if it does - rebase it please) -
Squashed related commits together