Performance/RegexpMatch: Fix some offenses - lib/gitlab/

What does this MR do and why?

This MR fixes some offenses of 👮 Performance/RegexpMatch enabled via !125399 (merged).

Auto-corrected via:

rubocop -a --only Performance/RegexpMatch ...

Auto-corrections manually reviewed and verified.

MR train 🚋

• Performance/RegexpMatch: Re-enable rule again a... (!125399 - merged) 🆕
• Performance/RegexpMatch: Fix some offenses - ta... (!125519 - merged)
• Performance/RegexpMatch: Fix some offenses - app/ (!125521 - merged)
• Performance/RegexpMatch: Fix some offenses - li... (!125522 - merged) ⬅ YOU ARE HERE

How to set up and validate locally

rubocop --only Performance/RegexpMatch

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.