Fix notification timing issue by sending in the latter of 2 events (#12110)

* Track host_status_counts and use that to process notifications

* Remove now unused setting

* Back out changes to callback class not needed after all

* Skirt the need for duck typing by leaning on the cached field

* Delete tests for deleted task

* Revert "Back out changes to callback class not needed after all"

This reverts commit 3b8ae350d218991d42bffd65ce4baac6f41926b2.

* Directly hardcode stats_event_type for callback class

* Fire notifications if stats event was never sent

* Remove test content for deleted methods

* Add placeholder for when no hosts matched

* Make field default be None, denote events processed with empty dict

* Make UI process null value for host_status_counts

* Fix tracking of EOF dispatch for system jobs

* Reorganize EVENT_MAP into class properties

* Consolidate conditional I missed from EVENT_MAP refactor

* Give up on the null condition, also applies for empty hosts

* Remove cls position argument not being used

* Move wrapup method out of class, add tests

awx/ui/src/screens/Job/JobOutput/JobOutput.js

@@ -652,7 +652,7 @@ function JobOutput({ job, eventRelatedSearchableKeys, eventSearchableKeys }) {
             isDeleteDisabled={isDeleting}
           />
         </OutputHeader>
-        <HostStatusBar counts={job.host_status_counts} />
+        <HostStatusBar counts={job.host_status_counts || {}} />
         <JobOutputSearch
           qsConfig={QS_CONFIG}
           job={job}