[Backport 2.x] (query assist) revert removing backticks #2574

Job	Run time
Run test group of app_analytics_test	14m 23s
Run test group of datasources_test	11m 29s
Run test group of event_analytics_test	22m 44s
Run test group of integrations_test	11m 34s
Run test group of metrics_analytics_test	14m 53s
Run test group of notebooks_test	14m 18s
Run test group of panels_test	15m 24s
Run test group of trace_analytics_test	27m 31s
	2h 12m 16s

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