Fix finalizer state after fixture setup errors - #14792
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Fixes #14775.
When fixture setup raises before
cached_resultis set, the fixture post-finalizer remains in_finalizers. A later request for the same class-scoped fixture then trips the internal assertion.Clear the fixture-local finalizers on setup failure and add a regression case with two tests under
-Werror.Tests:
python -m pytest testing/deprecated_test.py::test_class_scope_instance_method_is_deprecated -q