Add a couple of wrapper enums

[sunshowers]

These enums only have one variant at the moment -- more will be added in the future.

[codecov]

Codecov Report

Attention: Patch coverage is 15.25424% with 50 lines in your changes missing coverage. Please review.

Project coverage is 79.50%. Comparing base (0abfb0c) to head (95518db).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
nextest-runner/src/runner.rs	15.25%	50 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1905      +/-   ##
==========================================
- Coverage   79.56%   79.50%   -0.06%     
==========================================
  Files          80       80              
  Lines       20554    20571      +17     
==========================================
+ Hits        16353    16356       +3     
- Misses       4201     4215      +14     

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