Remove plot_radial_build.py

[clmould]

Description

Closes #4054

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.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.60%. Comparing base (311e5b3) to head (ad57ec1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4059      +/-   ##
==========================================
+ Coverage   46.51%   46.60%   +0.08%     
==========================================
  Files         123      122       -1     
  Lines       28802    28711      -91     
==========================================
- Hits        13398    13381      -17     
+ Misses      15404    15330      -74     

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