BUG: Fix __instancecheck__ and __subclasscheck__ of metaclass in pandas.core.dtypes.generic

[leonarduschen]

• closes BUG: apply on DataFrame results in TypeError: copy() missing 1 required positional argument: 'self' #46684 (Replace xxxx with the Github issue number)
• Tests added and passed if fixing a bug or adding a new feature
• All code checks passed.
• Added an entry in the latest doc/source/whatsnew/vX.X.X.rst file if fixing a bug or adding a new feature.

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#46684 is caused by wrong __instancecheck__ implementation, but __subclasscheck__ implementation is also wrong. I fixed both.

import pandas as pd
from pandas.core.dtypes.generic import ABCDataFrame

print(isinstance(pd.DataFrame, ABCDataFrame)) # Should have returned False, returned True instead
print(issubclass(pd.DataFrame(), ABCDataFrame)) # Should have raised, returned True instead

[rhshadrach]

Thanks for the PR! Looks really good, but I suppose a test should also be added for apply as well.

[leonarduschen]

Alright done!

[jreback]

lgtm over to you @rhshadrach

[rhshadrach]

lgtm

[rhshadrach]

Thanks @leonarduschen!