[internal] Add debug output for intermittent abort in poll_workunits
#14253
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Adds debug output to attempt to catch what we thought was a panic being converted into an abort, but which might just be an all-natural abort from another source.
See PyO3/pyo3#2102 for some discussion of the relevant problem. Beyond just being debug output, this patch actually seems to avoid the issue for the user who was experiencing it.
[ci skip-build-wheels]