Add NEOS solvers

[blnicho]

Summary/Motivation:

A few new solver interfaces were recently added to NEOS. We have a couple tests that fail to alert us when this happens so this PR adds the new NEOS solver interfaces to our NEOS infrastructure.

Changes proposed in this PR:

• Add highs, scip, fico-xpress, and octeract as valid NEOS solvers

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.

[mrmundt]

octeract

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.93%. Comparing base (34a3877) to head (4cbe542).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3919      +/-   ##
==========================================
- Coverage   89.94%   89.93%   -0.01%     
==========================================
  Files         902      902              
  Lines      106457   106457              
==========================================
- Hits        95749    95745       -4     
- Misses      10708    10712       +4     

Flag	Coverage Δ
builders	29.17% <ø> (-0.01%)	⬇️
default	86.24% <ø> (?)
expensive	35.64% <ø> (?)
linux	87.39% <ø> (-2.04%)	⬇️
linux_other	87.39% <ø> (-0.01%)	⬇️
oldsolvers	28.11% <ø> (+<0.01%)	⬆️
osx	82.72% <ø> (ø)
win	85.81% <ø> (-0.02%)	⬇️
win_other	85.81% <ø> (-0.02%)	⬇️

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