This patch moves the BlockingErrorCode table and the IsClassifierBlockingErrorCode / IsClassifierBlockingEventCode / GetClassifierBlockingEventCode / ClassifierBlockingErrorCodeToConsoleMessage helpers from UrlClassifierFeatureFactory into ChannelClassifierUtils so the latter no longer needs to depend on UrlClassifierFeatureFactory.h. Differential Revision: https://phabricator.services.mozilla.com/D301722