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GH-25633: [CI][Java][macOS] Ensure using bundled RE2 (#33711)

### Rationale for this change

If we have Homebrew's RE2, we may mix re2.h from Homebrew's RE2 and bundled RE2.
If we mix re2.h and libre2.a, we may generate wrong re2::RE2::Options. It may crashes our program.

### What changes are included in this PR?

Ensure removing Homebrew's RE2.

### Are these changes tested?

Yes.

### Are there any user-facing changes?

No.
* Closes: #25633

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Jacob Wujciak-Jens <jacob@wujciak.de>