Lint suppression cleanups (#47248)

* Unused pylint suppression cleanups

* Remove outdated pylint bug references

* Add flake8-noqa config and note to run it every now and then

* Add codes to noqa's

* Unused noqa cleanups

homeassistant/components/mysensors/config_flow.py

@@ -23,8 +23,6 @@ from homeassistant.core import callback
 import homeassistant.helpers.config_validation as cv
 
 from . import CONF_RETAIN, CONF_VERSION, DEFAULT_VERSION
-
-# pylint: disable=unused-import
 from .const import (
     CONF_BAUD_RATE,
     CONF_GATEWAY_TYPE,