Updating usePolling to cleanup after unmount (#1598) (#1600) #1694

Job	Run time
Run test group of app_analytics_test	20m 26s
Run test group of datasources_test	11m 1s
Run test group of event_analytics_test	22m 30s
Run test group of integrations_test	12m 0s
Run test group of metrics_analytics_test	11m 43s
Run test group of notebooks_test	15m 1s
Run test group of panels_test	14m 54s
Run test group of trace_analytics_test	27m 2s
	2h 14m 37s

Provide feedback