Style/RedundantFreeze: Fix offenses in rubocop, qa, tooling

What does this MR do and why?

This MR fixes some offenses for Style/RedundantFreeze.

Regexp and Range literals are frozen objects since Ruby 3.0.

From Ruby 3.0, this cop allows explicit freezing of interpolated string literals when # frozen-string-literal: true is used.

Auto-corrected via:

rubocop -a --only Style/RedundantFreeze rubocop scripts spec tooling qa

MR train

• Style/RedundantFreeze: Fix offenses in rubocop,... (!126506 - merged) YOU ARE HERE
• Style/RedundantFreeze: Fix offenses in EE (!126508 - merged)
• Style/RedundantFreeze: Fix offenses in app/ (!126510 - closed)
• Style/RedundantFreeze: Fix offenses in lib/gitl... (!126513 - closed)
• Style/RedundantFreeze: Fix offenses in lib/[a-f... (!126516 - closed)
• Style/RedundantFreeze: Fix offenses in lib (!126519 - closed)

How to set up and validate locally

REVEAL_RUBOCOP_TODO=1 rubocop --only Style/RedundantFreeze rubocop scripts spec tooling qa

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.