Determine if Arrow has S3 support at runtime in unit test.

[bdice]

Description

Resolves #11559. This PR improves the logic for testing S3 support. Previously this test relied on the value of CUDF_ENABLE_ARROW_S3, which only enables S3 support in Arrow if Arrow is being built from source by libcudf. If the Arrow package is found locally (rather than fetched and built), the value of CUDF_ENABLE_ARROW_S3 was irrelevant. Therefore, the tests using the compile-time value of CUDF_ENABLE_ARROW_S3 were unable to correctly detect Arrow's S3 support. This PR fixes the problem by checking Arrow S3 support at runtime.

I tested this locally for the case where Arrow doesn't have S3 support (our CI uses prebuilt Arrow packages with S3 enabled).

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[codecov]

Codecov Report

Base: 88.11% // Head: 88.14% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (ce10aae) compared to base (5c2150e).
Patch has no changes to coverable lines.

Additional details and impacted files

@@               Coverage Diff                @@
##           branch-22.12   #11560      +/-   ##
================================================
+ Coverage         88.11%   88.14%   +0.03%     
================================================
  Files               133      133              
  Lines             21982    21982              
================================================
+ Hits              19369    19376       +7     
+ Misses             2613     2606       -7     

Impacted Files	Coverage Δ
python/cudf/cudf/core/dataframe.py	93.77% <0.00%> (+0.04%)	⬆️
python/cudf/cudf/core/column/string.py	88.65% <0.00%> (+0.12%)	⬆️
python/cudf/cudf/core/groupby/groupby.py	91.51% <0.00%> (+0.20%)	⬆️
python/cudf/cudf/core/tools/datetimes.py	84.49% <0.00%> (+0.30%)	⬆️
python/cudf/cudf/core/column/lists.py	93.75% <0.00%> (+0.96%)	⬆️
python/strings_udf/strings_udf/__init__.py	86.27% <0.00%> (+1.96%)	⬆️

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[github-actions]

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[upsj]

LGTM! Does the CI setup test both configurations? Otherwise we might miss the failure detection breaking silently

[bdice]

LGTM! Does the CI setup test both configurations? Otherwise we might miss the failure detection breaking silently

No, we don't have a way to test the configuration with S3 disabled in CI. We would have to make significant changes to how dependencies are installed in CI. It might be possible once CI is more configurable via a GitHub Actions matrix build, but I don't think the benefit is worth the cost here.

[bdice]

@gpucibot merge