DashboardGrid: Add support to filter panels using variable (#77112)

* DashboardGrid panel filter

* Missed segment and changes per PR discussion

* Hide feature flag from docs

---------

Co-authored-by: Dominik Prokop <dominik.prokop@grafana.com>

pkg/services/featuremgmt/registry.go

@@ -974,5 +974,13 @@ var (
 			FrontendOnly: true,
 			Owner:        grafanaDashboardsSquad,
 		},
+		{
+			Name:         "panelFilterVariable",
+			Description:  "Enables use of the `systemPanelFilterVar` variable to filter panels in a dashboard",
+			Stage:        FeatureStageExperimental,
+			FrontendOnly: true,
+			Owner:        grafanaDashboardsSquad,
+			HideFromDocs: true,
+		},
 	}
 )

pkg/services/featuremgmt/toggles_gen.csv

@@ -138,3 +138,4 @@ alertmanagerRemoteOnly,experimental,@grafana/alerting-squad,false,false,false,fa
 annotationPermissionUpdate,experimental,@grafana/grafana-authnz-team,false,false,false,false
 extractFieldsNameDeduplication,experimental,@grafana/grafana-bi-squad,false,false,false,true
 dashboardSceneForViewers,experimental,@grafana/dashboards-squad,false,false,false,true
+panelFilterVariable,experimental,@grafana/dashboards-squad,false,false,false,true

pkg/services/featuremgmt/toggles_gen.go

@@ -562,4 +562,8 @@ const (
 	// FlagDashboardSceneForViewers
 	// Enables dashboard rendering using Scenes for viewer roles
 	FlagDashboardSceneForViewers = "dashboardSceneForViewers"
+
+	// FlagPanelFilterVariable
+	// Enables use of the `systemPanelFilterVar` variable to filter panels in a dashboard
+	FlagPanelFilterVariable = "panelFilterVariable"
 )