DashboardScene: Support panel relative time overrides and timeshift (#62844)

* Things are working

* update

* Added unit tests

* More tests

* minor fix

* Update

* Support hideTimeOverride

kinds/dashboard/dashboard_kind.cue

@@ -572,6 +572,9 @@ lineage: schemas: [{
 			// See: https://grafana.com/docs/grafana/latest/panels-visualizations/query-transform-data/#query-options
 			timeShift?: string
 
+			// Controls if the timeFrom or timeShift overrides are shown in the panel header
+			hideTimeOverride?: bool
+
 			// Dynamically load the panel
 			libraryPanel?: #LibraryPanelRef