chore(ci): report test results to codecov

[crenshaw-dev]

To help identify slow/flaky tests. Example output here: https://app.codecov.io/gh/crenshaw-dev/promoter/tests/main

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.57%. Comparing base (5c5b217) to head (2c5c71e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #95      +/-   ##
==========================================
- Coverage   54.97%   54.57%   -0.40%     
==========================================
  Files          10       10              
  Lines        1146     1147       +1     
==========================================
- Hits          630      626       -4     
- Misses        437      443       +6     
+ Partials       79       78       -1     

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