Fix ModelStatus compute type

[Wauplin]

Following the "compute type" revampt in API Inference (here - internal PR) cc @Narsil. Now the expected compute_type is not a string anymore but a dictionary. Example: gpu becomes {'gpu': {'gpu': 'a100', 'count': 8}}.

Not problematic for huggingface_hub (I don't expect anyone to have used this) but let's fix the test/docstrings.

[HuggingFaceDocBuilderDev]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.65%. Comparing base (46b38c2) to head (428fb78).

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2047       +/-   ##
===========================================
+ Coverage   45.35%   80.65%   +35.29%     
===========================================
  Files          71       71               
  Lines        8523     8523               
===========================================
+ Hits         3866     6874     +3008     
+ Misses       4657     1649     -3008     

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