add optimum solutions comparison notebook

[clmould]

Description

Closes #3920
I have removed the call to mfile_to_csv from introduction.ex.py as part of this PR as it was not adding anything of value to the notebook.

Checklist

I confirm that I have completed the following checks:

• My changes follow the PROCESS style guide
• I have justified any large differences in the regression tests caused by this pull request in the comments.
• I have added new tests where appropriate for the changes I have made.
• If I have had to change any existing unit or integration tests, I have justified this change in the pull request comments.
• If I have made documentation changes, I have checked they render correctly.
• I have added documentation for my change, if appropriate.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 47.84%. Comparing base (be8b546) to head (f70dc66).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4133      +/-   ##
==========================================
+ Coverage   47.51%   47.84%   +0.32%     
==========================================
  Files         141      141              
  Lines       29537    29754     +217     
==========================================
+ Hits        14035    14236     +201     
- Misses      15502    15518      +16     

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