Updated all instances of PLR6301 failing and removed from pyproject.toml

[j-a-foster]

Description

Corrects PLR6301 errors and removes check from pyproject.toml.

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 95.91837% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.74%. Comparing base (5e85c12) to head (9bda131).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
process/models/availability.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4296      +/-   ##
==========================================
+ Coverage   48.68%   48.74%   +0.05%     
==========================================
  Files         151      151              
  Lines       29296    29327      +31     
==========================================
+ Hits        14264    14295      +31     
  Misses      15032    15032              

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