Support Codecov v4 changes

[TheJulianJES]

IMPORTANT: workflows branch dm/update-ci-03272024 also needs to be updated for this repo.

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 94.81%. Comparing base (e2cdf1e) to head (5d8da04).
Report is 1 commits behind head on dev.

❗ Current head 5d8da04 differs from pull request most recent head 309ef3f. Consider uploading reports for the commit 309ef3f to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##              dev      #46      +/-   ##
==========================================
- Coverage   94.81%   94.81%   -0.01%     
==========================================
  Files          61       61              
  Lines        9193     9192       -1     
==========================================
- Hits         8716     8715       -1     
  Misses        477      477              

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