TST: Turn all unhandle warnings into errors in pytest

[pllim]

Unleash the kraken!

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 87.42%. Comparing base (9cd8552) to head (1d38d05). :warning: Report is 191 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #527   +/-   ##
=======================================
  Coverage   87.42%   87.42%           
=======================================
  Files          22       22           
  Lines        3874     3874           
=======================================
  Hits         3387     3387           
  Misses        487      487           

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[pllim]

Hmm 102 failed, 2623 passed, 721 skipped, 3 xfailed, 24 error in test_downstream but it is already red on master, so 🤷‍♀️

[pllim]

Some does look like warning from #522 came back to haunt you.