Memoize commit lookups between ChangeAccess calls
What
Caches commits between pushes to different branches/refs
Why
We were duplicating a lot of nfs/disk lookup by re-fetching commits for each branch when pushing a large number of refs.
Performance analysis
Timings
Memory usage
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Tests added for this feature/bug - Conform to the code review guidelines
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Has been reviewed by a Backend maintainer
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Conforms to the merge request performance guidelines -
End-to-end tests pass ( package-and-qamanual pipeline job)