gh-158998: Fix os.statx() ignoring follow_symlinks=False - #158999

Let me know if this change meet the criteria for needing tests or a NEWS item. I can add both if needed.

This will need both NEWS and a test (changes visible behavior of a feature that has been in a release). Pinged the contributor who added statx to hopefully review (haven’t reviewed the implementation myself yet)

The fix looks obviously correct. (Whoops!)

The tests should go in test_os.StatAttributeTests. Change check_statx_attributes to accept a follow_symlinks kwarg and pass it to the os.stat and os.statx calls, then add new test methods like test_statx_attributes that create a proper/broken symlink and pass follow_symlinks=False/True (four cases; can be four methods or one method with four subtests).

Ping me again for review when you've written the tests.