chore(tests): allow to run test suite without jaxtyping enabled

[jeertmans]

Previously, tests relying on runtime type checking would fail when --jaxtyping-packages="" was passed. Now, those tests are skipped.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.49%. Comparing base (85dfe2a) to head (8a4f25e).
⚠️ Report is 37 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #321       +/-   ##
===========================================
+ Coverage   34.38%   83.49%   +49.10%     
===========================================
  Files           4       32       +28     
  Lines         538     3017     +2479     
===========================================
+ Hits          185     2519     +2334     
- Misses        353      498      +145     

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[codspeed-hq]

CodSpeed Performance Report

Merging #321 will not alter performance

_{Comparing skip-jaxtyped (8a4f25e) with main (85dfe2a)}

Summary

✅ 8 untouched