(WIP:) trial for Combine cubes)

[pp-mo]

(basis here is #6321, itself not yet merged)
So far, just checking simplification

[codecov]

Codecov Report

Attention: Patch coverage is 95.05495% with 9 lines in your changes missing coverage. Please review.

Project coverage is 89.88%. Comparing base (ca863a0) to head (ac3137c).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/iris/_combine.py	92.95%	4 Missing and 1 partial ⚠️
lib/iris/loading.py	96.22%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6328   +/-   ##
=======================================
  Coverage   89.88%   89.88%           
=======================================
  Files          88       90    +2     
  Lines       23430    23447   +17     
  Branches     4361     4361           
=======================================
+ Hits        21059    21076   +17     
  Misses       1644     1644           
  Partials      727      727           

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