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GH-15025: [CI][C++][Homebrew] Ensure removing Python related commands (#15026)

If they exist and Homebrew's Python formula is updated, the update is failed:

https://github.com/apache/arrow/actions/runs/3729475663/jobs/6325425516

    ==> Pouring python@ 3.10--3.10.9.monterey.bottle.tar.gz
    Error: The `brew link` step did not complete successfully
    The formula built, but is not symlinked into /usr/local
    Could not symlink bin/2to3
    Target /usr/local/bin/2to3
    already exists. You may want to remove it:
      rm '/usr/local/bin/2to3'

    To force the link and overwrite all conflicting files:
      brew link --overwrite python@ 3.10

    To list all files that would be deleted:
      brew link --overwrite --dry-run python@ 3.10

    Possible conflicting files are:
    /usr/local/bin/2to3 -> /Library/Frameworks/Python.framework/Versions/3.11/bin/2to3
    /usr/local/bin/idle3 -> /Library/Frameworks/Python.framework/Versions/3.11/bin/idle3
    /usr/local/bin/pydoc3 -> /Library/Frameworks/Python.framework/Versions/3.11/bin/pydoc3
    /usr/local/bin/python3 -> /Library/Frameworks/Python.framework/Versions/3.11/bin/python3
    /usr/local/bin/python3-config -> /Library/Frameworks/Python.framework/Versions/3.11/bin/python3-config
* Closes: #15025

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>