4314 minor updates of cs figures

[j-a-foster]

Description

Made some minor changes to some CS figures in the Summary PDF. Namely, moved a legend outside of a plot and added a black border, as well as removed a red dot from the centre of the CS poloidal cross-section plot.

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

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.87%. Comparing base (d54820c) to head (f8e123a).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
process/core/io/plot/summary.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4427      +/-   ##
==========================================
+ Coverage   48.85%   48.87%   +0.01%     
==========================================
  Files         151      151              
  Lines       29390    29424      +34     
==========================================
+ Hits        14359    14381      +22     
- Misses      15031    15043      +12     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.