refactor: run crontab under sudo to support rhel systems

RHEL blocks users from executing crontab as themselves Because Of Reasons so we need to use sudo instead.

Also refactors file writing to properly support writing the permissions on sudoers files going forward.

Closes #5020

plugins/cron/src/triggers/triggers.go

@@ -20,6 +20,8 @@ func main() {
 	switch trigger {
 	case "cron-write":
 		err = cron.TriggerCronWrite()
+	case "install":
+		err = cron.TriggerInstall()
 	case "post-delete":
 		err = cron.TriggerPostDelete()
 	case "post-deploy":