gitaly_client: Drop deprecated fine-grained housekeeping RPCs
What does this MR do and why?
Gitaly has deprecated the fine-grained housekeeping RPCs RepackFull, RepackIncremental, PackRefs and GarbageCollect in favor of the new OptimizeRepository RPC. Rails is now exclusively using the new RPC, so let's drop the wrappers for the deprecated ones that will soon be removed in Gitaly.
Closes #353779 (closed)
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Edited by Patrick Steinhardt