Changes required make it possible to run with pytest-xdist

[unkcpz]

pytest-xdist although not run through CI, but can run from local if the changes here are adapted. The changes needed since xdist has a know limitation that the order and amount of test must be consistent.

[danielhollas]

Discussed offline, LGTM!

This is a clear improvement regardless of original motivation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.90%. Comparing base (ef60b66) to head (7c17de9).
Report is 135 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6631      +/-   ##
==========================================
+ Coverage   77.51%   77.90%   +0.40%     
==========================================
  Files         560      567       +7     
  Lines       41444    42147     +703     
==========================================
+ Hits        32120    32831     +711     
+ Misses       9324     9316       -8     

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