Simplify pylint workflow

[gtrevisan]

close all other outstanding pylint issues with a few ad-hoc exclusions and a handful of global ignores, which will be handled separately in the immediate future:

• C0114 @ https://pylint.pycqa.org/en/latest/user_guide/messages/convention/missing-module-docstring.html
• C0115 @ https://pylint.pycqa.org/en/latest/user_guide/messages/convention/missing-class-docstring.html
• C0116 @ https://pylint.pycqa.org/en/latest/user_guide/messages/convention/missing-function-docstring.html
• C0301 @ https://pylint.pycqa.org/en/latest/user_guide/messages/convention/line-too-long.html
• R0903 @ https://pylint.pycqa.org/en/latest/user_guide/messages/refactor/too-few-public-methods.html
• W4902 @ https://pylint.pycqa.org/en/latest/user_guide/messages/warning/deprecated-method.html

then, finally, simplify linting workflow!

[gtrevisan]

Your code has been rated at 10.00/10 because Greg disabled all instances of stuff that would have lowered it!

:tada: