Add CODECOV_TOKEN to GHA pytest-with-coverage workflow

[douglatornell]

A CODECOV_TOKEN has been added to the pytest-with-coverage.yaml file in the .github workflows. This token is necessary for uploading coverage reports to codecov, and for codecov to add test coverage report comments to pull requests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.93%. Comparing base (b899b74) to head (67204b5).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #57   +/-   ##
=======================================
  Coverage   53.93%   53.93%           
=======================================
  Files          11       11           
  Lines        1105     1105           
  Branches      211      211           
=======================================
  Hits          596      596           
  Misses        483      483           
  Partials       26       26           

Flag	Coverage Δ
unittests	53.93% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

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