Rewrite rugged ref updates to use gitaly RPCs
What does this MR do and why?
Soon we will begin to use the praefect database in tests and when this happens we can no longer rely on being able to directly manipulate repositories without praefect knowing.
Ref updates are low hanging fruit that can easily be migrated to RPCs in bulk.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by James Fargher