Fix sign of residuals

[dweindl]

Residuals (ReturnData::res) were previously computed as y - my, but should be my - y.

• Fix computing res/sres
• Update expected results for Python-generated models (Matlab-model results are still sign-flipped).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.60%. Comparing base (a71c990) to head (0fba9e1).
⚠️ Report is 56 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2896      +/-   ##
==========================================
+ Coverage   79.55%   79.60%   +0.04%     
==========================================
  Files         358      358              
  Lines       23033    23033              
  Branches     1581     1581              
==========================================
+ Hits        18325    18335      +10     
+ Misses       4697     4687      -10     
  Partials       11       11              

Flag	Coverage Δ
cpp	74.95% <37.50%> (+0.04%)	⬆️
cpp_python	33.18% <25.00%> (ø)
petab	38.98% <87.50%> (ø)
python	73.82% <37.50%> (+0.04%)	⬆️
sbmlsuite-jax	34.56% <0.00%> (ø)

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Files with missing lines	Coverage Δ
python/sdist/amici/jax/model.py	86.54% <100.00%> (ø)
src/rdata.cpp	93.03% <100.00%> (ø)

... and 4 files with indirect coverage changes

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