Replace poetry with pip

[MichalHaluza]

This commit attempts to fix UBI 8 / python 3.6 distribution pipelines that are currently block on ubiconfig incompatibility. It also follows up on "Refresh dependency management setup" topic from Rohan's Handover Notes.

• Uses renovate with pip-compile.
• All dependencies are pinned by pip-compile.
• One pip-compile output per tested python version.
• Renovate set up to run pip-compile as a weekly chore.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (2249c65) to head (b925f39).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #120   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           13        13           
  Lines          365       365           
=========================================
  Hits           365       365           

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[rbikar]

I just hope that in near future we could do [1] and move to GH actions for pypi upload [2]
[1] RHELDST-33563 - [PoC] Automate GitHub package release and use trusted publisher for PyPI publish
[2] https://packaging.python.org/en/latest/guides/publishing-package-distribution-releases-using-github-actions-ci-cd-workflows/

[rbikar]

@MichalHaluza
not sure if intended but All dependencies are pinned by pip-compile. - this doesn't seem to be 100% true - as reqs are pinned to dev/test and not to realistically used requirement files used for build.