TST: Add regression tests for enlarging MultiIndex with None keys (GH#59153) #63012
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doc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.Add comprehensive tests to prevent regression of the bug where enlarging a DataFrame with a MultiIndex fails when one or more level keys are None.
Test basic enlargement with None keys
Test multiple None keys in different levels
Test IndexSlice functionality with None
Test retrieval after enlargement