add backend disabled dialog #8249

Job	Run time
integration-app-harness (redis, 3.11.11, 1)	6m 33s
integration-app-harness (redis, 3.11.11, 1)	6m 37s
integration-app-harness (redis, 3.11.11, 2)	6m 57s
integration-app-harness (redis, 3.11.11, 2)	6m 57s
integration-app-harness (redis, 3.12.8, 1)	6m 32s
integration-app-harness (redis, 3.12.8, 1)	6m 33s
integration-app-harness (redis, 3.12.8, 2)	6m 49s
integration-app-harness (redis, 3.12.8, 2)	6m 49s
integration-app-harness (redis, 3.13.1, 1)	7m 3s
integration-app-harness (redis, 3.13.1, 1)	7m 3s
integration-app-harness (redis, 3.13.1, 2)	6m 55s
integration-app-harness (redis, 3.13.1, 2)	6m 55s
integration-app-harness (memory, 3.11.11, 1)	7m 13s
integration-app-harness (memory, 3.11.11, 1)	7m 13s
integration-app-harness (memory, 3.11.11, 2)	6m 43s
integration-app-harness (memory, 3.11.11, 2)	6m 43s
integration-app-harness (memory, 3.12.8, 1)	6m 17s
integration-app-harness (memory, 3.12.8, 1)	6m 17s
integration-app-harness (memory, 3.12.8, 2)	6m 30s
integration-app-harness (memory, 3.12.8, 2)	6m 30s
integration-app-harness (memory, 3.13.1, 1)	5m 50s
integration-app-harness (memory, 3.13.1, 1)	5m 50s
integration-app-harness (memory, 3.13.1, 2)	6m 19s
integration-app-harness (memory, 3.13.1, 2)	6m 19s
	2h 39m 27s

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