PERF: groupby.first and groupby.last fallback to apply for EAs

[rhshadrach]

#57589 showed groupby.first and groupby.last are falling back to apply for certain EAs. This should not fallback.

[phofl]

Do you know the type of eas that fall back?

[rhshadrach]

From the CI run in the linked PR:

FAILED pandas/tests/extension/test_arrow.py::TestArrowArray::test_groupby_agg_extension[decimal128(7, 3)] - NotImplementedError
FAILED pandas/tests/extension/test_arrow.py::TestArrowArray::test_groupby_agg_extension[string] - NotImplementedError
FAILED pandas/tests/extension/test_arrow.py::TestArrowArray::test_groupby_agg_extension[binary] - NotImplementedError
FAILED pandas/tests/extension/test_arrow.py::TestArrowArray::test_groupby_agg_extension[time32[s]] - NotImplementedError
FAILED pandas/tests/extension/test_arrow.py::TestArrowArray::test_groupby_agg_extension[time32[ms]] - NotImplementedError
FAILED pandas/tests/extension/test_arrow.py::TestArrowArray::test_groupby_agg_extension[time64[us]] - NotImplementedError
FAILED pandas/tests/extension/test_arrow.py::TestArrowArray::test_groupby_agg_extension[time64[ns]] - NotImplementedError
FAILED pandas/tests/extension/test_arrow.py::TestArrowArray::test_groupby_agg_extension[date32[day]] - NotImplementedError
FAILED pandas/tests/extension/test_arrow.py::TestArrowArray::test_groupby_agg_extension[date64[ms]] - NotImplementedError
FAILED pandas/tests/extension/test_numpy.py::TestNumpyExtensionArray::test_groupby_agg_extension[float] - NotImplementedError: function is not implemented for this dtype: float64
FAILED pandas/tests/extension/test_numpy.py::TestNumpyExtensionArray::test_groupby_agg_extension[object] - NotImplementedError: function is not implemented for this dtype: object
FAILED pandas/tests/extension/test_sparse.py::TestSparseArray::test_groupby_agg_extension[0] - NotImplementedError: function is not implemented for this dtype: Sparse[float64, 0]
FAILED pandas/tests/extension/test_sparse.py::TestSparseArray::test_groupby_agg_extension[nan] - NotImplementedError: function is not implemented for this dtype: Sparse[float64, nan]
FAILED pandas/tests/extension/decimal/test_decimal.py::TestDecimalArray::test_groupby_agg_extension - NotImplementedError: function is not implemented for this dtype: decimal
FAILED pandas/tests/extension/test_interval.py::TestIntervalArray::test_groupby_agg_extension - NotImplementedError: function is not implemented for this dtype: interval[float64, right]
FAILED pandas/tests/extension/json/test_json.py::TestJSONArray::test_groupby_agg_extension - NotImplementedError: function is not implemented for this dtype: json
= 16 failed, 221228 passed, 6664 skipped, 1811 xfailed, 94 xpassed, 40 warnings in 1525.24s (0:25:25) =

[phofl]

Thx, none of those is really surprising unfortunately