hooks: pylint: fix pre-commit

[casperdcl]

• correctly define pylint pre-commit hook

.pre-commit-config.yaml states that the pylint hook is defined locally, yet .pre-commit-hooks.yaml fails to define it. As a result, attempting to commit will result in an error.

Defining the hook's language as system and asking devs to manually run pip install .[tests] goes against fundamental principles of pre-commit hooks. None of the other hooks require this.

In any case pylint itself defines https://github.com/PyCQA/pylint/blob/master/.pre-commit-hooks.yaml so we should just use theirs.

• fixes hooks: pylint: pre-commit failure #4145

[casperdcl]

@skshetry I guess you'll have more experience with this but I suspect we need something like --init-hook="sys.path.append($SOME_EXTERNAL_PYTHONPATH)" to fix the import errors.

[efiop]

#4145 (comment)