Always reset pytest working directory to invocation dir

[timothy-nunn]

Getting the cwd within the return_to_root fixture was prone to error when another fixture ran first and changed the working directory. I have set the fixture now to return the working directory to the invocation directory (where the user called pytest from).

This issue manifests as an error 128 from the git subprocess when running just pytest

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.84%. Comparing base (a3db864) to head (04cda95).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4384   +/-   ##
=======================================
  Coverage   48.84%   48.84%           
=======================================
  Files         151      151           
  Lines       29406    29406           
=======================================
  Hits        14363    14363           
  Misses      15043    15043           

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