Fix/53098 numeric only disallow non bools

[divya1974]

• closes ERR: numeric_only in reduction operations should disallow passing non-bools #53098 (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 type annotations to new arguments/methods/functions.
• Added an entry in the latest doc/source/whatsnew/vX.X.X.rst file if fixing a bug or adding a new feature.

Ran tests:
Groupby tests: 29766 passed, 440 skipped, 45 xfailed, 39 xpassed, 1 warning.
Window tests (with Numba disabled to avoid an env crash): 9869 passed, 28 skipped, 91 xfailed.
Frame reductions tests: 2338 passed, 2 xfailed.
No real test failures (only xfails/skips) after applying the deprecation behavior.

Changes
Implemented the deprecation approach for numeric_only=None during the 2.x cycle:

• Added deprecate_numeric_only_none helper in _validators.py
• Wired the helper + validate_bool_kwarg(..., none_allowed=True) into:
  frame.py : (DataFrame._reduce)
  series.py : (Series._reduce)
  groupby.py :(GroupBy._cython_agg_general)
  rolling.py : (Rolling._validate_numeric_only)
• Updated tests in [test_reductions.py] to assert the deprecation warning using tm.assert_produces_warning
• Added a whatsnew note in v2.1.0.rst documenting the deprecation.

[divya1974]

I see some tests failing, which I couldn't catch locally. Any suggestion on what I am missing will be helpful.

[Alvaro-Kothe]

Some of them can be fixed if you merge from main.