replace flaky test retry utility

[fmigneault]

Replace pytest-rerunfailures by pytest-retry to avoid falsy failure result in JUnit reporting following successful-retry during from coverage for codecov flaky test analysis.

Avoid the flagged tests as seen in #758 (comment) which are "known flaky tests".

• Relates to explore fixes of coverage actions #762

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.69%. Comparing base (5a4805e) to head (9401a5b).
Report is 85 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #790      +/-   ##
==========================================
+ Coverage   87.66%   87.69%   +0.02%     
==========================================
  Files          82       82              
  Lines       21256    21259       +3     
  Branches     2874     2875       +1     
==========================================
+ Hits        18635    18644       +9     
+ Misses       1868     1859       -9     
- Partials      753      756       +3     

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