awx modules wait on event processing finished (ansible#15152)

This change makes "wait: true" for jobs and syncs
look at the event_processing_finished instead of
finished field.

Right now there is a race condition where
a module might try to delete an inventory, but the events
for an inventory sync have not yet finished. We have a
RelatedJobsPreventDeleteMixin that checks for this condition.

bulk jobs don't have event_processing_finished so we just
use finished field in that case.

awx_collection/plugins/module_utils/controller_api.py

@@ -1038,7 +1038,10 @@ def wait_on_url(self, url, object_name, object_type, timeout=30, interval=2):
         # Grab our start time to compare against for the timeout
         start = time.time()
         result = self.get_endpoint(url)
-        while not result['json']['finished']:
+        wait_on_field = 'event_processing_finished'
+        if wait_on_field not in result['json']:
+            wait_on_field = 'finished'
+        while not result['json'][wait_on_field]:
             # If we are past our time out fail with a message
             if timeout and timeout < time.time() - start:
                 # Account for Legacy messages