chore(python): Fix mypy errors on Windows

[KDruzhkin]

We need to consider two scenarios:

• An attribute is undefined, mypy is unhappy, we add: # type: ignore[attr-defined].
• An attribute is defined, mypy is unhappy about the 'ignore' comment, we add: # type: ignore[unused-ignore].

So we need both comments in one place: # type: ignore[attr-defined,unused-ignore].

[KDruzhkin]

The documentation refers to the Angular convention, which mentions the build type.

In the log I see chore as well, which is more frequent.

git log --oneline | rg "build\(python\)" | less  # many lines
git log --oneline | rg "chore\(python\)" | less  # few lines

You may want to fix the name of this PR.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 81.47%. Comparing base (4048c3a) to head (1cc86f2). Report is 2 commits behind head on main.

Files	Patch %	Lines
py-polars/polars/_cpu_check.py	0.00%	3 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16570      +/-   ##
==========================================
- Coverage   81.49%   81.47%   -0.02%     
==========================================
  Files        1414     1414              
  Lines      185525   185525              
  Branches     2997     2997              
==========================================
- Hits       151191   151165      -26     
- Misses      33818    33844      +26     
  Partials      516      516              

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[stinodego]

Thanks - I'll double check this on my Windows PC. Perhaps it can be structured a bit differently not to need these ignores in the first place.