[KNITRO] Separate Extra Information by MIP Relevance

[eminyouskn]

Fixes # .

Summary/Motivation:

This PR updates the iteration count handling for KNITRO. Since the iteration count is not meaningful for MIP problems, the solver now returns None in those cases.

Changes proposed in this PR:

Legal Acknowledgement

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1. I agree my contributions are submitted under the BSD license.
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.45%. Comparing base (4d67fa6) to head (60fa6cb).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3802   +/-   ##
=======================================
  Coverage   89.45%   89.45%           
=======================================
  Files         905      905           
  Lines      105467   105485   +18     
=======================================
+ Hits        94341    94364   +23     
+ Misses      11126    11121    -5     

Flag	Coverage Δ
builders	29.13% <30.00%> (-0.01%)	⬇️
default	86.07% <100.00%> (?)
expensive	35.76% <30.00%> (?)
linux	86.76% <30.00%> (-2.46%)	⬇️
linux_other	86.76% <30.00%> (-0.02%)	⬇️
osx	82.91% <30.00%> (-0.01%)	⬇️
win	84.99% <30.00%> (-0.01%)	⬇️
win_other	84.99% <30.00%> (-0.01%)	⬇️

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[eminyouskn]

@mrmundt I just update this PR with what we would like to report as extra info in both cases.

[mrmundt]

Love it! Thank you! 🥇