Convert PROCESS warnings to Python

[timothy-nunn]

Draft until #3630

[codecov-commenter]

Codecov Report

❌ Patch coverage is 47.77778% with 376 lines in your changes missing coverage. Please review.
✅ Project coverage is 37.03%. Comparing base (e75a913) to head (d372fd1).
⚠️ Report is 415 commits behind head on main.

Files with missing lines	Patch %	Lines
process/constraints.py	51.53%	269 Missing ⚠️
process/physics.py	4.76%	20 Missing ⚠️
process/superconducting_tf_coil.py	5.26%	18 Missing ⚠️
process/build.py	11.11%	8 Missing ⚠️
process/pfcoil.py	11.11%	8 Missing ⚠️
process/scan.py	22.22%	7 Missing ⚠️
process/warning_handler.py	80.55%	7 Missing ⚠️
process/tf_coil.py	33.33%	6 Missing ⚠️
process/fw.py	16.66%	5 Missing ⚠️
process/power.py	20.00%	4 Missing ⚠️
... and 12 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3642      +/-   ##
==========================================
+ Coverage   36.37%   37.03%   +0.65%     
==========================================
  Files          88       90       +2     
  Lines       22088    23658    +1570     
==========================================
+ Hits         8035     8762     +727     
- Misses      14053    14896     +843     

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