t*: 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 do the full "no bottles" build. This is t*.

[issyl0]

truffle test failure:

CONNECTION ERROR: Couldn't connect to node [http://127.0.0.1:50975/.](http://127.0.0.1:50975/)
  Truffle v5.11.5 (core: 5.11.5)
  Node v22.5.1
  Error: truffle: failed
  ::error::truffle: failed
  An exception occurred within a child process:
    BuildError: Failed executing: /usr/local/Cellar/truffle/5.11.5/bin/truffle test