Dashboards: Remove emptyDashboardPage feature flag (#81188)

* remove emptyDashboardPage feature toggle from DashNav

* remove emptyDashboardPage feature toggle from NewDashboardWithDS

* remove emptyDashboardPage feature toggle from DashboardGrid

* remove emptyDashboardPage feature toggle from DashboardModel

* remove emptyDashboardPage feature toggle from initDashboard

* remove unused AddPanelWidged component

* remove add-panel type from test

* remove emptyDashboardPage feature flag from registry.go

pkg/services/featuremgmt/registry.go

@@ -313,17 +313,6 @@ var (
 			AllowSelfServe: true,
 			Created:        time.Date(2023, time.July, 24, 12, 0, 0, 0, time.UTC),
 		},
-		{
-			Name:              "emptyDashboardPage",
-			Description:       "Enable the redesigned user interface of a dashboard page that includes no panels",
-			Stage:             FeatureStageGeneralAvailability,
-			FrontendOnly:      true,
-			Expression:        "true", // enabled by default
-			Owner:             grafanaDashboardsSquad,
-			AllowSelfServe:    false,
-			HideFromAdminPage: true,
-			Created:           time.Date(2023, time.March, 28, 12, 0, 0, 0, time.UTC),
-		},
 		{
 			Name:           "disablePrometheusExemplarSampling",
 			Description:    "Disable Prometheus exemplar sampling",

pkg/services/featuremgmt/toggles_gen.csv

@@ -35,7 +35,6 @@ mysqlAnsiQuotes,experimental,@grafana/backend-platform,2022-10-12,false,false,fa
 accessControlOnCall,preview,@grafana/identity-access-team,2022-10-19,false,false,false,false
 nestedFolders,preview,@grafana/backend-platform,2022-10-22,false,false,false,false
 nestedFolderPicker,GA,@grafana/grafana-frontend-platform,2023-07-24,false,false,false,true
-emptyDashboardPage,GA,@grafana/dashboards-squad,2023-03-28,false,false,false,true
 disablePrometheusExemplarSampling,GA,@grafana/observability-metrics,2022-12-19,false,false,false,false
 alertingBacktesting,experimental,@grafana/alerting-squad,2022-10-20,false,false,false,false
 editPanelCSVDragAndDrop,experimental,@grafana/grafana-bi-squad,2022-12-20,false,false,false,true

pkg/services/featuremgmt/toggles_gen.go

@@ -151,10 +151,6 @@ const (
 	// Enables the new folder picker to work with nested folders. Requires the nestedFolders feature toggle
 	FlagNestedFolderPicker = "nestedFolderPicker"
 
-	// FlagEmptyDashboardPage
-	// Enable the redesigned user interface of a dashboard page that includes no panels
-	FlagEmptyDashboardPage = "emptyDashboardPage"
-
 	// FlagDisablePrometheusExemplarSampling
 	// Disable Prometheus exemplar sampling
 	FlagDisablePrometheusExemplarSampling = "disablePrometheusExemplarSampling"