t_pulse_repitition -> t_plant_pulse_plasma_present

[clmould]

Description

This was missed in the updates as the original variable name was spelt wrong in the docs
Was renamed in #3934

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 48.63%. Comparing base (b0b7d56) to head (898d0f3).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4458   +/-   ##
=======================================
  Coverage   48.62%   48.63%           
=======================================
  Files         151      151           
  Lines       29705    29710    +5     
=======================================
+ Hits        14445    14449    +4     
- Misses      15260    15261    +1     

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