Check Gitaly when running `rake dev:setup`
What does this MR do?
Add a pre flight check to rake dev:setup
. Check if we can connect to Gitaly by calling a simple, really cheap RPC.
Does this MR meet the acceptance criteria?
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Tests added for this feature/bug - Review
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Has been reviewed by Backend
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What are the relevant issue numbers?
None, ran into it a bit too often so just decided to fix it.