Enabling Pixi for extra tests

[jlnav]

Also addresses #1403

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.29%. Comparing base (2ad1722) to head (a29e66b).
⚠️ Report is 19 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1654      +/-   ##
===========================================
- Coverage    78.31%   78.29%   -0.03%     
===========================================
  Files           76       76              
  Lines         7591     7591              
  Branches      1120     1120              
===========================================
- Hits          5945     5943       -2     
- Misses        1460     1461       +1     
- Partials       186      187       +1     

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