Implement supercon enum pf

[chris-ashe]

Description

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

❌ Patch coverage is 51.35135% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.80%. Comparing base (a285d2b) to head (94a2af9).
⚠️ Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
process/models/pfcoil.py	51.85%	13 Missing ⚠️
process/models/tfcoil/superconducting.py	50.00%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4374   +/-   ##
=======================================
  Coverage   48.79%   48.80%           
=======================================
  Files         151      151           
  Lines       29408    29348   -60     
=======================================
- Hits        14351    14323   -28     
+ Misses      15057    15025   -32     

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[clmould]

Just a few tiny things but happy otherwise!

[clmould]

Do the other instances like this need this longer, more descriptive comment?