Bug 1547724 - send cron failure notifications to sheriffs / ciduty r=…

…aryx

Differential Revision: https://phabricator.services.mozilla.com/D30598

--HG--
extra : moz-landing-system : lando

.taskcluster.yml

@@ -136,8 +136,6 @@ tasks:
               else:
                 $if: 'tasks_for == "action"'
                 then:
-                - "notify.email.taskcluster-notifications+action-task@mozilla.com.on-failed"
-                - "notify.email.taskcluster-notifications+action-task@mozilla.com.on-exception"
                 - "index.gecko.v2.${repository.project}.pushlog-id.${push.pushlog_id}.actions.${ownTaskId}"
                 else:  # cron
                 - "index.gecko.v2.${repository.project}.latest.taskgraph.decision-${cron.job_name}"