TST/CLN: Remove groupby tests with mutation #60619
Merged
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doc/source/whatsnew/vX.X.X.rst
file if fixing a bug or adding a new feature.We no longer support UDFs that mutate the data
https://pandas.pydata.org/pandas-docs/dev/user_guide/gotchas.html#mutating-with-user-defined-function-udf-methods
so I don't think we need to test for this anymore. Plan to move the remaining tests in this file into apply in a followup.