BUG: Fix NaT handling in the PyArray_CompareFunc for datetime and timedelta #20081
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Backport of #19607.
In #12658 and #15068 the sort ordering for datetime and timedelta was changed
so that NaT sorts to the end, but the internal compare array function was not
updated.
Fixes #19574.
If a test should be added for this, please let me know where.