refactor(python): Remove unused code paths in read_parquet

[stinodego]

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[codecov]

Codecov Report

Attention: Patch coverage is 82.35294% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 81.13%. Comparing base (49e4244) to head (dcec42b).
Report is 6 commits behind head on main.

Files	Patch %	Lines
py-polars/polars/io/parquet/functions.py	81.25%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15532      +/-   ##
==========================================
- Coverage   81.16%   81.13%   -0.04%     
==========================================
  Files        1362     1363       +1     
  Lines      175001   175161     +160     
  Branches     2532     2527       -5     
==========================================
+ Hits       142037   142112      +75     
- Misses      32481    32571      +90     
+ Partials      483      478       -5     

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