Codacy coverage upload, auto-assign pr and flake8 update

[martinvonk]

Short Description

Sinced #515 the codacy coverage report is uploaded from the GitHub CI test that takes the longest. This was a temporary fix because the if statements in the ci.yml did not work properly. Also, it is not a very robust solution if we introduce a CI test that takes longer (e.g. readthedocs #458). With this change the codacy coverage report is specifically created in the notebooks toxenv in the GitHub CI Test suite for Jupyter Notebooks.

[codacy-production]

Coverage summary from Codacy

Merging #566 (7e97c3f) into dev (ea6797e) - See PR on Codacy

Coverage variation	Diff coverage
✅ +0.29% (target: +0.00%)	∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (ea6797e)	4891	3512	71.81%
Head commit (7e97c3f)	4871 (-20)	3512 (+0)	72.10% (+0.29%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#566)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[martinvonk]

Latest commit 7e97c3f auto assigns authors to pull requests which is kinda neat I think