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GH-15189: [R] Skip S3 tests on MacOS 10.13 (#33613)

# Which issue does this PR close?

Closes #15189

# Rationale for this change

The curl/ssl runtime on 10.13 results in a segfault when the process exits (even though all tests pass), so we get a spurious failure on our 10.13 runner test.

# What changes are included in this PR?

Updates the `skip_if_not_available()` function to special case the "s3" feature. The "re2" feature is handled similarly to prevent spurious valgrind errors from being reported.

# Are these changes tested?

These changes can only be tested via crossbow + the 10.13 runner (and locally on my own 10.13 machine after the PR is live and can be pulled there).

# Are there any user-facing changes?

Nope!
* Closes: #15189

Lead-authored-by: Dewey Dunnington <dewey@fishandwhistle.net>
Co-authored-by: Dewey Dunnington <dewey@dunnington.ca>
Co-authored-by: Dewey Dunnington <dewey@voltrondata.com>
Signed-off-by: Jacob Wujciak-Jens <jacob@wujciak.de>