Apply match-case instead of if-elif

[chris-ashe]

Description

Since we now require Python >=3.10 we should use match-case statements over if-else because it supports structural pattern matching, avoids repeating the same variable name, and makes complex conditional checks much easier to read

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 35.45535% with 730 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.92%. Comparing base (5d2d7d5) to head (4c03360).

Files with missing lines	Patch %	Lines
process/models/tfcoil/superconducting.py	34.07%	118 Missing ⚠️
process/models/tfcoil/base.py	25.00%	105 Missing ⚠️
process/models/physics/plasma_geometry.py	1.23%	80 Missing ⚠️
process/models/pfcoil.py	40.74%	64 Missing ⚠️
process/models/physics/confinement_time.py	55.55%	60 Missing ⚠️
process/core/init.py	26.92%	38 Missing ⚠️
process/core/solver/objectives.py	0.00%	37 Missing ⚠️
process/models/physics/current_drive.py	62.19%	31 Missing ⚠️
process/models/blankets/hcpb.py	32.50%	27 Missing ⚠️
process/core/solver/constraints.py	37.50%	25 Missing ⚠️
... and 12 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4599      +/-   ##
==========================================
- Coverage   49.99%   49.92%   -0.07%     
==========================================
  Files         151      151              
  Lines       29916    30036     +120     
==========================================
+ Hits        14956    14996      +40     
- Misses      14960    15040      +80     

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