Remove `fetch_repository_as_mirror` RPC from Gitaly
The following discussion from !26550 (merged) should be addressed:
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@zj-gitlab started a discussion: @proglottis This is the only client that uses this RPC. We might want to consider to remove the RPC completely, making our RPC surface smaller. What do you think? That potentially means we should port this RPC from Ruby to Go, but it might be worth it nonetheless?