Revert "Route minion module failures through the event system"

Reverts saltstack/salt#16861

@cachedout @thatch45 This PR was causing some pretty bad test breakage on develop. Usually I can figure out the fix quickly, but there are a lot of failures in a bunch of different places. I think this just needs to be resubmitted with some fixes for the test suite in mind before we should merge this change back in.