Upload test results to CodeCov

[aik099]

Got an e-mail from CodeCov about a new Test Analytics feature (see https://about.codecov.io/blog/find-failing-and-flaky-tests-with-codecov-test-analytics/ ) and decided to try it out.

Doesn't work as expected (test results are not getting uploaded even with a CodeCov token). I've reported it to the CodeCov: codecov/test-results-action#98 .

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.40%. Comparing base (e778774) to head (f41d494).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #403   +/-   ##
=========================================
  Coverage     85.40%   85.40%           
  Complexity      181      181           
=========================================
  Files             1        1           
  Lines           500      500           
=========================================
  Hits            427      427           
  Misses           73       73           

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[aik099]

I'm going to merge this because I think CodeCov doesn't like, that the updated workflow (where CODECOV_TOKEN is given to the new action) is absent in the master branch.