g*: Fix Homebrew/NoFileutilsRmrf RuboCop offenses

[issyl0]

• Have you followed the guidelines for contributing?
• Have you ensured that your commits follow the commit style guide?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>)? If this is a new formula, does it pass brew audit --new <formula>?

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• Part of rubocop: Discourage the use of rm_f and rm_rf in formulae and casks brew#17705.
• Different approach from the previous massive PR - I'm splitting them up per-alphabet letter (ish) and letting CI build. This is g*.

[branchvincent]

We may need to revert these PR's, also seeing postinstall failures with gcc: https://github.com/Homebrew/homebrew-core/actions/runs/10190043249/job/28189185229?pr=179176#step:4:720