Add sol outboard enum

[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 52.94118% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.14%. Comparing base (a3d041d) to head (b0236f5).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
process/models/physics/scrape_off_layer.py	5.88%	16 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4514      +/-   ##
==========================================
+ Coverage   49.13%   49.14%   +0.01%     
==========================================
  Files         152      152              
  Lines       29806    29844      +38     
==========================================
+ Hits        14644    14668      +24     
- Misses      15162    15176      +14     

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