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 59.52381% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.79%. Comparing base (a285d2b) to head (c72c3e6).

Files with missing lines	Patch %	Lines
process/models/pfcoil.py	62.50%	12 Missing ⚠️
process/models/tfcoil/superconducting.py	50.00%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4374   +/-   ##
=======================================
  Coverage   48.79%   48.79%           
=======================================
  Files         151      151           
  Lines       29408    29408           
=======================================
  Hits        14351    14351           
  Misses      15057    15057           

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