Reduce includes in models

[dweindl]

Remove unnecessary includes in the generated code. Reduces serial compilation time by a second or two.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.98%. Comparing base (dcbbae0) to head (ee92c5c).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2953      +/-   ##
==========================================
- Coverage   76.60%   75.98%   -0.62%     
==========================================
  Files         307      307              
  Lines       20134    20140       +6     
  Branches     1553     1553              
==========================================
- Hits        15423    15304     -119     
- Misses       4698     4823     +125     
  Partials       13       13              

Flag	Coverage Δ
cpp	72.18% <100.00%> (+0.05%)	⬆️
cpp_python	37.93% <100.00%> (+0.01%)	⬆️
petab	38.99% <100.00%> (+0.02%)	⬆️
python	69.82% <100.00%> (+0.06%)	⬆️
sbmlsuite-jax	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
include/amici/abstract_model.h	100.00% <ø> (ø)
include/amici/model.h	71.42% <ø> (ø)
python/sdist/amici/_codegen/cxx_functions.py	97.14% <100.00%> (+0.59%)	⬆️
python/sdist/amici/de_export.py	97.16% <100.00%> (ø)
src/abstract_model.cpp	4.28% <ø> (ø)

... and 7 files with indirect coverage changes

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