🐛 Add cryostat internal radius output and update obsolete variables

[chris-ashe]

Description

• Added a new po.ovarrf call to output the cryostat internal radius with the label "Cryostat internal radius (m)" and the variable fwbs_variables.r_cryostat_inboard. This allows plot_proc.py to plot the cryostat again.

• : Added new obsolete variable mappings for cryostat dimensions, including clhsf, ddwex, clh1, and rpf2dewar. This should have been included in ❄️ Update cryostat docs #3501.

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.

[stuartmuldrew]

Fine

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 30.84%. Comparing base (29fccbf) to head (5edffc5).

Files with missing lines	Patch %	Lines
process/build.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3527      +/-   ##
==========================================
- Coverage   30.84%   30.84%   -0.01%     
==========================================
  Files          80       80              
  Lines       19326    19327       +1     
==========================================
  Hits         5961     5961              
- Misses      13365    13366       +1     

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