BUG: Fix drop(index=[pd.NA]) for PyArrow-backed Index (GH#63304)#63910

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dedlYTiTAN wants to merge 8 commits intopandas-dev:mainfrom

dedlYTiTAN:fix-gh63304-arrow-drop-na-v2

Commits on Jan 28, 2026

FIX: drop(index=[pd.NA]) fails for Arrow-backed index (#63304)
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TST: Skip Arrow drop test if pyarrow < 13.0.0
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STY: linting fixes (isort, whitespace) for #63304 test
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STY: Apply ruff format to test_gh63304.py
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FIX: restrict null-casting in isin to explicit pd.NA (fix regression)
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STY: apply ruff fixes to arrow/array.py
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REF: replace lib.missing.NA with isna() to fix mypy error
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Merge branch 'main' into fix-gh63304-arrow-drop-na-v2
Keerthirajan M
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