Add praefect startup check
What does this MR do?
gitaly!3989 (merged) adds a praefect subcommand praefect -config <config_file check
that runs through a series of startup checks to make sure the gitaly cluster setup is healthy. If any fatal check fails, we want to stop Praefect from starting up.
This is the omnibus change to do that.
Related issues
fixes: #6464 (closed)
Checklist
See Definition of done.
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Edited by John Cai