pytest pyfuncitem._isyieldedfunction() is no more

when i stumbled uppon wdb, i wanted to try it with pytest, and ran into the error in `pytest_pyfunc_call`

i believe the hook should b implemented in terms of pytest_exception_interact if possible

Start by reproducing the reported error when using wdb with pytest and inspect the pytest_pyfunc_call hook. Compare its use of the removed _isyieldedfunction attribute with pytest_exception_interact, then verify that the hook works with the current pytest behavior without raising this error.

Written by the indexing model from the issue text.