Improve CI

[jmsmkn]

This PR is a big cleanup:

• Tests were taking somewhere between 25 minutes and 6 hours (!)
  • They now run in parallel with random ordering in < 10 minutes on GitHub Actions, the non-docker test suite is done in 40s on my laptop
  • Fixed bug with docker file provisioning
• Fixed ~8000 warnings in the test suite, made new warnings errors
• Added tests against Python 3.9
• Updated the template containers to use the latest libraries and python
• Dropped legacy things
  • Windows bat file templates, users should use WSL2 now
  • Python 3.6 (EOL in December, users can still use evalutils 0.2.x if they need it)
• Removed print statements and unused xfail decorators

[codecov[bot]]

Codecov Report

Merging #314 (091e70c) into master (992241b) will increase coverage by 0.32%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #314      +/-   ##
==========================================
+ Coverage   85.24%   85.57%   +0.32%     
==========================================
  Files          13       13              
  Lines         881      894      +13     
  Branches      127      128       +1     
==========================================
+ Hits          751      765      +14     
+ Misses         87       86       -1     
  Partials       43       43              

Impacted Files	Coverage Δ
evalutils/__version__.py	100.00% <100.00%> (ø)
evalutils/io.py	90.62% <100.00%> (+0.96%)	:arrow_up:
evalutils/stats.py	86.30% <100.00%> (ø)
evalutils/utils.py	100.00% <100.00%> (ø)
evalutils/evalutils.py	81.60% <0.00%> (+0.18%)	:arrow_up:
evalutils/cli.py	73.33% <0.00%> (+1.76%)	:arrow_up:

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