Unit test for QCQO

[Utkarsh-Detha]

Change

• Added a small unit test for QCQO problems for Pyomo-MOSEK.

( I did not want to obfuscate the purpose of #2647, so I made this a separate PR)

Summary/Motivation:

A while ago there was a bug due to mosek_direct passing upper-triangular elements when setting Q matrix elements. This was fixed, but no unit test was added for this. That has been changed.

Changes proposed in this PR:

• Unit test (small qcqo problem).

Legal Acknowledgement

By contributing to this software project, I have read the contribution guide and agree to the following terms and conditions for my contribution:

1. I agree my contributions are submitted under the BSD license.
2. I represent I am authorized to make the contributions and grant the license. If my employer has rights to intellectual property that includes these contributions, I represent that I have received permission to make contributions and grant the required license on behalf of that employer.

[jsiirola]

(Note, this includes #2647, so merging this will merge/close both)

[codecov]

Codecov Report

Base: 81.67% // Head: 87.06% // Increases project coverage by +5.39% 🎉

Coverage data is based on head (6d6136a) compared to base (7b1c396).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2682      +/-   ##
==========================================
+ Coverage   81.67%   87.06%   +5.39%     
==========================================
  Files         757      757              
  Lines       84510    84511       +1     
==========================================
+ Hits        69025    73582    +4557     
+ Misses      15485    10929    -4556     

Flag	Coverage Δ
linux	84.50% <0.00%> (?)
osx	74.54% <0.00%> (?)
other	84.68% <0.00%> (?)
win	81.84% <0.00%> (?)

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

Impacted Files	Coverage Δ
pyomo/solvers/plugins/solvers/mosek_direct.py	67.88% <100.00%> (+0.29%)	⬆️
pyomo/core/expr/visitor.py	93.40% <0.00%> (+0.15%)	⬆️
pyomo/repn/plugins/nl_writer.py	85.89% <0.00%> (+0.16%)	⬆️
pyomo/repn/plugins/ampl/ampl_.py	86.20% <0.00%> (+0.19%)	⬆️
pyomo/solvers/plugins/solvers/GAMS.py	67.90% <0.00%> (+0.24%)	⬆️
pyomo/contrib/interior_point/interior_point.py	95.03% <0.00%> (+0.26%)	⬆️
pyomo/solvers/plugins/solvers/xpress_direct.py	72.82% <0.00%> (+0.30%)	⬆️
pyomo/contrib/appsi/solvers/cbc.py	82.79% <0.00%> (+0.32%)	⬆️
pyomo/contrib/appsi/solvers/ipopt.py	88.85% <0.00%> (+0.33%)	⬆️
... and 101 more

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