Re-enable Gitaly commit_raw_diffs migration
What does this MR do?
It re-enables Gitaly's commit_raw_diffs migration, it was disabled in !11826 (merged) because the server-side implementation hasn't been released yet.
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