BUG/TST: non-numeric EA reductions
- [x] [Tests added and passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#writing-tests) if fixing a bug or adding a new feature
- [x] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).
- [x] Added [type annotations](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#type-hints) to new arguments/methods/functions.
- [x] Added an entry in the latest `doc/source/whatsnew/v3.0.0.rst` file if fixing a bug or adding a new feature.

Fixes a few bugs related to non-numeric EA reductions and expands testing by un-skipping a number of existing tests.

```
> pytest -k test_reduce pandas/tests/extension/

# main branch
2160 passed, 1222 skipped, 154 xfailed

# PR
2507 passed, 886 skipped, 143 xfailed
```


BUG fix example:

```
In [1]: import pandas as pd

In [2]: arr = pd.array([None], dtype="duration[ms][pyarrow]")

In [3]: pd.DataFrame({"a": arr}).min().dtype

# main branch
Out[3]: int64[pyarrow]

# PR
Out[3]: duration[ms][pyarrow]
```
Thanks @lukemanley 