Fix Rubocop violations for Style/FrozenStringLiteralComment

Summary

After !51930 (merged) is merged we can fix all remaining violations for the Style/FrozenStringLiteralComment cop.

Involved components

See the list in .rubocop_manual_todo.yml: https://gitlab.com/gitlab-org/gitlab/-/blob/0b4aa0ef94f73df45d60d6bc49e0285abefc3e64/.rubocop_manual_todo.yml#L1473-1782

Auto-correction

• Temporarily enable Layout/EmptyLineAfterMagicComment in .rubocop.yml
• Auto-correct with rubocop -A --only Style/FrozenStringLiteralComment,Layout/EmptyLineAfterMagicComment ...