Add volt-seconds needed for ramp and Ejima coefficient to plasma info…

[chris-ashe]

…rmation plot

Description

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 46.30%. Comparing base (1c32433) to head (6aac973).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4040   +/-   ##
=======================================
  Coverage   46.30%   46.30%           
=======================================
  Files         123      123           
  Lines       28962    28962           
=======================================
  Hits        13411    13411           
  Misses      15551    15551           

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