Add full toroidal cross section

[chris-ashe]

This PR adds the full toroidal cross section to the summary file. Some bug fixes to the toroidal_cross_section() function were performed

Checklist

I confirm that I have completed the following checks:

• My changes follow the PROCESS style guide
• I have justified any large differences in the regression tests caused by this pull request in the comments.
• I have added new tests where appropriate for the changes I have made.
• If I have had to change any existing unit or integration tests, I have justified this change in the pull request comments.
• If I have made documentation changes, I have checked they render correctly.
• I have added documentation for my change, if appropriate.

[j-a-foster]

Happy with full toroidal cross section output.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 3.44828% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.65%. Comparing base (c4a5893) to head (3736290).

Files with missing lines	Patch %	Lines
process/core/io/plot/summary.py	3.44%	28 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4444      +/-   ##
==========================================
+ Coverage   48.63%   48.65%   +0.01%     
==========================================
  Files         151      151              
  Lines       29676    29669       -7     
==========================================
  Hits        14434    14434              
+ Misses      15242    15235       -7     

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