(fix): manage dask cluster from controller

[flying-sheep]

I tested this locally with and without -n auto.

Due to my 16 cores it failed pretty reliably in parallel mode and now doesn’t.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.84%. Comparing base (3502bb1) to head (2eecc44).
Report is 50 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1929       +/-   ##
===========================================
- Coverage   82.82%   58.84%   -23.99%     
===========================================
  Files          45       45               
  Lines        6777     6798       +21     
===========================================
- Hits         5613     4000     -1613     
- Misses       1164     2798     +1634     

see 45 files with indirect coverage changes

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