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 75.19%. Comparing base (9a5eb5b) to head (03db394).

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   75.22%   75.19%   -0.04%     
==========================================
  Files          64       64              
  Lines        7145     7148       +3     
  Branches     1261     1263       +2     
==========================================
  Hits         5375     5375              
- Misses       1285     1288       +3     
  Partials      485      485              

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