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Add a new faster git refs finder

Robert May requested to merge faster-git-refs-finder into master

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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MR acceptance checklist

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Edited by Robert May

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