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Let fetch_ref pull from Gitaly instead of from disk

Jacob Vosmaer (GitLab) requested to merge gitaly-fetch-ref into master

What does this MR do?

Adds a feature flag to let Gitlab::Git::Repository#fetch_ref pull from Gitaly instead of from disk.

I found a 'creative' use of fetch_ref that would get much less efficient because of this (it was fetching from the repo into itself) so I refactored some code to be able to remove that one call site of fetch_ref.

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Gitaly all the things.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-org/gitaly/issues/585

Edited by Jacob Vosmaer (GitLab)

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