Bnb/obs model 4dim fix

[bnb32]

Small fix for idw_fill with 4D models. Deprecating random forest code

[codecov-commenter]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 88.27%. Comparing base (66d756c) to head (b2796b0).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #68      +/-   ##
==========================================
- Coverage   88.36%   88.27%   -0.09%     
==========================================
  Files          26       24       -2     
  Lines        3730     3565     -165     
==========================================
- Hits         3296     3147     -149     
+ Misses        434      418      -16     

Flag	Coverage Δ
unittests	88.27% <100.00%> (-0.09%)	:arrow_down:

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