Support Codecov v4 changes

[TheJulianJES]

DRAFT -- do not merge yet (needs below workflow PR merged first, CI will fail for now)

Passes the CODECOV_TOKEN GH secret to the shared workflow.
Related PR with more information:

• Update Codecov action to v4 workflows#17

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.68%. Comparing base (be242b3) to head (23fd668).

❗ Current head 23fd668 differs from pull request most recent head dde6493. Consider uploading reports for the commit dde6493 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #615   +/-   ##
=======================================
  Coverage   99.68%   99.68%           
=======================================
  Files          74       74           
  Lines        5014     5014           
=======================================
  Hits         4998     4998           
  Misses         16       16           

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