[MINOR] CI: Report test results

[EnricoMi]

What changes were proposed in this pull request?

Reports test results in Github UI.

Why are the changes needed?

Individual results of test failures are easier to access than scrolling through long job logs: example
Test stats are nicely presented in corresponding pull request: EnricoMi#2 (comment)

Does this PR introduce any user-facing change?

No.

How was this patch tested?

Manual.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5d027c0) 53.38% compared to head (5b5a43b) 55.27%.
Report is 32 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1506      +/-   ##
============================================
+ Coverage     53.38%   55.27%   +1.89%     
- Complexity     2729     2807      +78     
============================================
  Files           422      407      -15     
  Lines         24046    21988    -2058     
  Branches       2051     2077      +26     
============================================
- Hits          12836    12153     -683     
+ Misses        10412     9077    -1335     
+ Partials        798      758      -40     

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[zuston]

Wow, I like this feature! Thanks @EnricoMi .

Could you help review this? @kaijchen I think it's in your defensive area

[smallzhongfeng]

Great work !