Add codecov test report uploading for flaky test analysis.

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More information here: https://app.codecov.io/gh/getsentry/launchpad/tests/new

[runningcode]

• Add codecov test report uploading for flaky test analysis. #121 👈 (View in Graphite)
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.91%. Comparing base (c78200a) to head (9007c72).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #121   +/-   ##
=======================================
  Coverage   69.91%   69.91%           
=======================================
  Files          84       84           
  Lines        6555     6555           
  Branches      796      796           
=======================================
  Hits         4583     4583           
  Misses       1660     1660           
  Partials      312      312           

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