Add test for mixed models (NLP)

[tmigot]

I catch a bug where with the current system calling hprod and hess allocate because the vector y is expected of size ncon and not nnln.

#178

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.60 🎉

Comparison is base (1b615ea) 93.40% compared to head (e90becc) 94.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #180      +/-   ##
==========================================
+ Coverage   93.40%   94.00%   +0.60%     
==========================================
  Files          13       14       +1     
  Lines        1622     1651      +29     
==========================================
+ Hits         1515     1552      +37     
+ Misses        107       99       -8     

Impacted Files	Coverage Δ
src/ad_api.jl	92.66% <100.00%> (+4.78%)	⬆️

... and 6 files with indirect coverage changes

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[github-actions]

Package name	latest	stable
CaNNOLeS.jl
DCISolver.jl
DerivativeFreeSolvers.jl
JSOSolvers.jl
NLPModelsIpopt.jl
OptimizationProblems.jl
Percival.jl
QuadraticModels.jl
SolverBenchmark.jl
SolverTools.jl