fix(python): Fix credential provider error

[nameexhaustion]

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• Regression from fix: Do not auto-init credential providers if credential fetch returns error #21090

[codecov]

Codecov Report

Attention: Patch coverage is 62.50000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 79.26%. Comparing base (a578d51) to head (973dad0).
Report is 43 commits behind head on main.

Files with missing lines	Patch %	Lines
py-polars/polars/io/cloud/credential_provider.py	62.50%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #21092      +/-   ##
==========================================
- Coverage   79.27%   79.26%   -0.01%     
==========================================
  Files        1586     1585       -1     
  Lines      225676   226009     +333     
  Branches     2588     2592       +4     
==========================================
+ Hits       178894   179149     +255     
- Misses      46192    46265      +73     
- Partials      590      595       +5     

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[nameexhaustion]

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