ci: Use codecov-action for reporting test results

[mborgerson]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.87%. Comparing base (a3a8f87) to head (c2ff184).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #46   +/-   ##
=======================================
  Coverage   46.87%   46.87%           
=======================================
  Files           2        2           
  Lines         576      576           
  Branches       75       75           
=======================================
  Hits          270      270           
  Misses        291      291           
  Partials       15       15           

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