fix: upload codecov report as a separate workflow step

[bradenmacdonald]

Description

We're seeing PRs like #1331 fail because of temporary CodeCov errors. To fix this, it's necessary to run the entire workflow all over again. This PR makes the same improvement we recently made to frontend-app-learning in openedx/frontend-app-learning#1476 so that codecov uploading is a separate step that can be re-tried without needing to run the tests all over again. This makes it faster to resolve the issue, and makes it more clear what step failed.

Supporting information

Same as openedx/frontend-app-learning#1476

Testing instructions

You can only test this by checking that the CI build ran correctly.

[openedx-webhooks]

Thanks for the pull request, @bradenmacdonald!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.95%. Comparing base (0349188) to head (36f3407).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1355   +/-   ##
=======================================
  Coverage   92.95%   92.95%           
=======================================
  Files        1037     1037           
  Lines       19508    19508           
  Branches     4073     4131   +58     
=======================================
  Hits        18134    18134           
+ Misses       1312     1309    -3     
- Partials       62       65    +3     

☔ View full report in Codecov by Sentry.
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[bradenmacdonald]

Thanks for the quick review @KristinAoki !