fix(python): Normalize path in sink_csv

[coastalwhite]

Fixes #17473.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.49%. Comparing base (ad836bd) to head (9de1a33).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17476      +/-   ##
==========================================
- Coverage   80.49%   80.49%   -0.01%     
==========================================
  Files        1483     1483              
  Lines      195010   195010              
  Branches     2781     2781              
==========================================
- Hits       156972   156969       -3     
- Misses      37527    37530       +3     
  Partials      511      511              

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[etiennebacher]

Hi, I had a question in another PR (#16869 (comment)) regarding whether paths should be normalized on the Rust or on the Python side. The other PR adds some implementation in Rust but you do this in Python, so I'm wondering which should be done.

[coastalwhite]

I think this change is so small, such that until the path normalisation is fully handled on the rust side, this does no harm.