Have the SciML linter allow non-yaml network formats

[BSnelling]

Such as "equinox": https://github.com/PEtab-dev/libpetab-python/pull/new/bes/equinox_format

For now I didn't include any validation of the network model file, just skip the NNModel construction and validation if the network format is not yaml.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.09%. Comparing base (e557e44) to head (0ea0187).

Files with missing lines	Patch %	Lines
petab/v2/extensions/sciml.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #499      +/-   ##
==========================================
- Coverage   75.12%   75.09%   -0.04%     
==========================================
  Files          64       64              
  Lines        7157     7160       +3     
  Branches     1265     1267       +2     
==========================================
  Hits         5377     5377              
- Misses       1290     1293       +3     
  Partials      490      490              

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