[clmould]

Description

Closes #4715

Example now find converging IN.DAT
VaryRun raises Error if unable to find converging IN.DAT within max number of allowed iterations - clearer to user instead of just printing to terminal
Remove unused/nonexistent parameters from test run_process.conf

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 33.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.26%. Comparing base (dcdedfd) to head (3390471).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
process/core/io/vary_run/config.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4716      +/-   ##
==========================================
- Coverage   50.26%   50.26%   -0.01%     
==========================================
  Files         181      181              
  Lines       30629    30632       +3     
==========================================
+ Hits        15395    15396       +1     
- Misses      15234    15236       +2     

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