Remove MATLAB-specific model code

[dweindl]

Get rid of the Python-generated code flag and any MATLAB-specific model functions.

Related to #2727.

[codecov]

Codecov Report

❌ Patch coverage is 96.10895% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.43%. Comparing base (dcbbae0) to head (6ff4a21).
⚠️ Report is 130 commits behind head on main.

Files with missing lines	Patch %	Lines
src/model.cpp	98.51%	2 Missing ⚠️
models/model_calvetti_py/model_calvetti_py.h	0.00%	1 Missing ⚠️
models/model_dirac_py/model_dirac_py.h	0.00%	1 Missing ⚠️
models/model_events_py/model_events_py.h	0.00%	1 Missing ⚠️
...odel_jakstat_adjoint_py/model_jakstat_adjoint_py.h	0.00%	1 Missing ⚠️
...ls/model_nested_events_py/model_nested_events_py.h	0.00%	1 Missing ⚠️
models/model_neuron_py/model_neuron_py.h	0.00%	1 Missing ⚠️
models/model_robertson_py/model_robertson_py.h	0.00%	1 Missing ⚠️
models/model_steadystate_py/model_steadystate_py.h	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2957      +/-   ##
==========================================
- Coverage   76.60%   76.43%   -0.17%     
==========================================
  Files         307      307              
  Lines       20134    19947     -187     
  Branches     1553     1508      -45     
==========================================
- Hits        15423    15247     -176     
+ Misses       4698     4687      -11     
  Partials       13       13              

Flag	Coverage Δ
cpp	72.60% <96.10%> (+0.47%)	⬆️
cpp_python	38.17% <61.47%> (+0.25%)	⬆️
petab	39.38% <55.73%> (+0.41%)	⬆️
python	70.35% <89.88%> (+0.59%)	⬆️
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)
include/amici/model_dae.h	72.72% <ø> (-2.28%)	⬇️
include/amici/model_dimensions.h	45.71% <ø> (-0.77%)	⬇️
include/amici/model_ode.h	100.00% <ø> (ø)
include/amici/model_state.h	97.11% <ø> (-0.09%)	⬇️
include/amici/serialization.h	95.17% <ø> (-0.03%)	⬇️
src/abstract_model.cpp	4.68% <ø> (+0.40%)	⬆️
src/backwardproblem.cpp	90.97% <100.00%> (+0.64%)	⬆️
src/model_dae.cpp	50.45% <100.00%> (+2.25%)	⬆️
... and 12 more

... and 11 files with indirect coverage changes

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