GH-15054: [Python] Finalize S3 on pytest exit to prevent shutdown crashes #33793
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For some reason destroying an S3Client at shutdown can cause a crash in our tests. It appears to be because S3's logging is already shut down. I wouldn't think this would happen because I would think the linker would tear down S3 shared libraries AFTER it tears down Arrow shared libraries.
However, we can also finalize S3 in conftest.py to prevent this crash.
It would still be good to understand the root cause. Otherwise we need to advise our users to call finalize_s3.