Changed Explorer Data Grid useage of timestamp (#1479) #71

Job	Run time
Run test group of app_analytics_test	17m 5s
Run test group of datasources_test	10m 59s
Run test group of event_analytics_test	22m 3s
Run test group of integrations_test	11m 32s
Run test group of metrics_analytics_test	14m 46s
Run test group of notebooks_test	14m 13s
Run test group of panels_test	15m 34s
Run test group of trace_analytics_test	27m 51s
	2h 14m 3s

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