Add a new faster git refs finder
What does this MR do and why?
This adds a new implementation of GitRefsFinder
that instead uses the Gitaly ListRefs
RPC to perform the ref search on the Gitaly-side rather than loading all branches/tags into Ruby and then processing them.
Currently the RPC does not support sorting, pagination, or regular expressions, so the functionality of this new finder is not a direct replacement. However we can start to replace certain uses of the old finder with this new one.
Changelog: added
Related #372053 (closed)
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