Respect ExpData settings in gradient checks

[dweindl]

Previously, Model settings were used, independently of whether ExpData had different settings.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.80%. Comparing base (25adebf) to head (ec6c1af).
⚠️ Report is 101 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2995      +/-   ##
==========================================
- Coverage   76.48%   75.80%   -0.69%     
==========================================
  Files         308      308              
  Lines       19540    19546       +6     
  Branches     1500     1500              
==========================================
- Hits        14945    14816     -129     
- Misses       4582     4717     +135     
  Partials       13       13              

Flag	Coverage Δ
cpp	72.89% <92.85%> (+<0.01%)	⬆️
cpp_python	38.25% <57.14%> (-0.01%)	⬇️
petab	38.86% <78.57%> (-0.01%)	⬇️
python	69.62% <92.85%> (+<0.01%)	⬆️
sbmlsuite-jax	?

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Files with missing lines	Coverage Δ
python/sdist/amici/gradient_check.py	95.68% <100.00%> (+0.23%)	⬆️

... and 6 files with indirect coverage changes

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