ai/box: Allow box to run any streamdiffusion flavour

[victorges]

Simplify some stuff and allow any pipeline to be run with inline aimodels.json config.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 31.96406%. Comparing base (d095d96) to head (1f0c7e9).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@                 Coverage Diff                 @@
##              master       #3742         +/-   ##
===================================================
+ Coverage   31.94301%   31.96406%   +0.02105%     
===================================================
  Files            158         158                 
  Lines          47519       47519                 
===================================================
+ Hits           15179       15189         +10     
+ Misses         31437       31429          -8     
+ Partials         903         901          -2     

see 5 files with indirect coverage changes

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see 5 files with indirect coverage changes

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