Add the junit_log_passing_tests ini flag to skip logging output for passing tests.

[jeffreyrack]

Closes #4559 by adding the junit_log_passing_tests ini flag which can be turned off to disable logging test output and logging for passing tests in the junit XML report.

[codecov]

Codecov Report

Merging #5052 into features will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##           features    #5052      +/-   ##
============================================
+ Coverage     96.07%   96.07%   +<.01%     
============================================
  Files           114      114              
  Lines         25778    25790      +12     
  Branches       2552     2553       +1     
============================================
+ Hits          24765    24777      +12     
  Misses          704      704              
  Partials        309      309

Impacted Files	Coverage Δ
testing/test_junitxml.py	97.83% <100%> (+0.02%)	⬆️
src/_pytest/junitxml.py	95.26% <100%> (+0.06%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e04936f...da3f836. Read the comment docs.

[nicoddemus]

Great work, thanks a lot @jeffreyrack! 👍

Really sorry about the delay on this, it seems this has slipped through the cracks.

[andkononykhin]

@jeffreyrack @nicoddemus Hello. Thank you for that option but seems the change introduces one drawback: it disables any junit logging for failed tests which don't fail during teardown phase.

[twmr]

@andkononykhin Hi, thank you very much for the report. Can you create a ticket/issue for this regression with a minimal example please? Thx

[andkononykhin]

@thisch I created #5430. Sorry for the delay.