Use pytest to generate junit xml files for python tests

[ahcorde]

Signed-off-by: ahcorde [email protected]

🦟 Bug fix

Summary

Python unit tests currently don't generate junit xml files for consumption by Jenkins. This results in Jenkins indicating that there are no failing tests when python tests are failing. couldn't find a way to generate these files using the builtin unittest python library, so I have added a dependency on pytest. If pytest is not available, a CMake warning is emitted.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

Merging #446 (a30f5bc) into ign-math6 (73b23d1) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           ign-math6     #446   +/-   ##
==========================================
  Coverage      99.65%   99.65%           
==========================================
  Files             67       67           
  Lines           6392     6392           
==========================================
  Hits            6370     6370           
  Misses            22       22           

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