Draft: Use Gitaly version that doesn't start rubyserver

What does this MR do and why?

In 1 we remove the launching of the rubyserver. To be sure this works I'm creating this commit so we can test QA and omnibus packages with this Gitaly change.

Epic: &7874 (closed)

How to set up and validate locally

Nothing in particular to test, just normal operation.

MR acceptance checklist

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