refactor: Test Python docs build

[nameexhaustion]

build-python-docs is failing on main -

Log output AttributeError: 'function' object has no attribute '__arrow_c_stream__'

Warning, treated as error:
autodoc: failed to import method 'DataFrame.__arrow_c_stream__' from module 'polars'; the following exception was raised:
Traceback (most recent call last):
  File "/home/runner/work/polars/polars/.venv/lib/python3.12/site-packages/sphinx/util/inspect.py", line 374, in safe_getattr
    return getattr(obj, name, *defargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'function' object has no attribute '__arrow_c_stream__'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/runner/work/polars/polars/.venv/lib/python3.12/site-packages/sphinx/ext/autodoc/importer.py", line 209, in import_object
    obj = attrgetter(obj, mangled_name)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/runner/work/polars/polars/.venv/lib/python3.12/site-packages/sphinx/ext/autodoc/__init__.py", line 329, in get_attr
    return autodoc_attrgetter(self.env.app, obj, name, *defargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/runner/work/polars/polars/.venv/lib/python3.12/site-packages/sphinx/ext/autodoc/__init__.py", line 2844, in autodoc_attrgetter
    return safe_getattr(obj, name, *defargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/runner/work/polars/polars/.venv/lib/python3.12/site-packages/sphinx/util/inspect.py", line 390, in safe_getattr
    raise AttributeError(name) from exc
AttributeError: __arrow_c_stream__

make: *** [Makefile:27: html] Error 2
Error: Process completed with exit code 2.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.64%. Comparing base (194b31e) to head (3ccf78e).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #19187      +/-   ##
==========================================
- Coverage   79.65%   79.64%   -0.01%     
==========================================
  Files        1531     1531              
  Lines      208937   208939       +2     
  Branches     2418     2418              
==========================================
- Hits       166421   166412       -9     
- Misses      41969    41980      +11     
  Partials      547      547              

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[nameexhaustion]

#19188