Show gitaly logs when it failed to boot

Context

See gitlab-org/quality/engineering-productivity/master-broken-incidents#7977 (comment 2041250159)

What does this MR do and why?

Show the gitaly logs in the CI/CD job log when it failed to boot.

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

I added a raise 'woops' when booting gitaly, and I get the following locally:

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.