Extract repr_html directly from cube summary

[stephenworsley]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 92.30769% with 3 lines in your changes missing coverage. Please review.

Project coverage is 89.81%. Comparing base (75e09f5) to head (1832263).
Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/iris/experimental/representation.py	92.30%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6476   +/-   ##
=======================================
  Coverage   89.80%   89.81%           
=======================================
  Files          90       90           
  Lines       23755    23773   +18     
  Branches     4418     4431   +13     
=======================================
+ Hits        21334    21352   +18     
  Misses       1672     1672           
  Partials      749      749           

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