Add @unique decorator to enum classes for improved uniqueness enforce…

[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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.42%. Comparing base (c4ceacb) to head (49b4c4f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4542      +/-   ##
==========================================
+ Coverage   49.34%   49.42%   +0.07%     
==========================================
  Files         150      150              
  Lines       29814    29861      +47     
==========================================
+ Hits        14712    14759      +47     
  Misses      15102    15102              

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