AAP-39559 Wait for all event processing to finish, add fallback task #11135

Job	Run time
awx_collection integration (a-h, ^[a-h])	11m 34s
awx-operator	12m 8s
awx_collection sanity (stable-2.17)	1m 31s
awx_collection integration (i-p, ^[i-p])	15m 30s
awx_collection integration (r-z0-9, ^[r-z0-9])	14m 32s
dev-env	9m 43s
api-test	13m 30s
api-migrations	10m 20s
api-lint	1m 29s
api-swagger	4m 46s
awx-collection	2m 28s
api-schema	7m 13s
combine awx_collection integration coverage	36s
	1h 45m 20s

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