Remove unused Gitlab::Git::Commit#to_diff argument
What does this MR do?
Remove some unused code.
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
This unused code makes migrating to Gitaly harder. Deleting code is the best migration.
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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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