flake8 in develop gets sloppy

[ReimarBauer]

I recognized that his was not show as failure by our flake8 checket.

#2373 (comment)

[matrss]

Yes, because flake8 is only run for mslib/ and tests/. I don't know why this decision was made, I've already noted that this is not great in #2145 (comment). We should enable it for the entire repository, including e.g. tutorials/, docs/, setup.py, etc.

[matrss]

And we should revisit the list of globally ignored lint rules and check if we really want to skip them or if they would make sense to enable.

[ReimarBauer]

I think we should change flake8 check for the whole dir. I guess after adding tutorials we forget to adopt the rules and we thought only on dir levels. docs/conf.py was initially autogenerated

We have to check with Joern for the all lint rules option.