Remove feature toggle data source page header (#77751)

* remove feature toggle:dataSourcePageHeader

* remove feature flag: dataSourcePageHeader

* remove unused prop:alertingSupported

pkg/services/featuremgmt/registry.go

@@ -497,13 +497,6 @@ var (
 			Stage:        FeatureStagePublicPreview,
 			Owner:        grafanaBiSquad,
 		},
-		{
-			Name:         "dataSourcePageHeader",
-			Description:  "Apply new pageHeader UI in data source edit page",
-			FrontendOnly: true,
-			Stage:        FeatureStagePublicPreview,
-			Owner:        enterpriseDatasourcesSquad,
-		},
 		{
 			Name:         "extraThemes",
 			Description:  "Enables extra themes",

pkg/services/featuremgmt/toggles_gen.csv

@@ -67,7 +67,6 @@ enableElasticsearchBackendQuerying,GA,@grafana/observability-logs,false,false,fa
 advancedDataSourcePicker,GA,@grafana/dashboards-squad,false,false,false,true
 faroDatasourceSelector,preview,@grafana/app-o11y,false,false,false,true
 enableDatagridEditing,preview,@grafana/grafana-bi-squad,false,false,false,true
-dataSourcePageHeader,preview,@grafana/enterprise-datasources,false,false,false,true
 extraThemes,experimental,@grafana/grafana-frontend-platform,false,false,false,true
 lokiPredefinedOperations,experimental,@grafana/observability-logs,false,false,false,true
 pluginsFrontendSandbox,experimental,@grafana/plugins-platform-backend,false,false,false,true

pkg/services/featuremgmt/toggles_gen.go

@@ -279,10 +279,6 @@ const (
 	// Enables the edit functionality in the datagrid panel
 	FlagEnableDatagridEditing = "enableDatagridEditing"
 
-	// FlagDataSourcePageHeader
-	// Apply new pageHeader UI in data source edit page
-	FlagDataSourcePageHeader = "dataSourcePageHeader"
-
 	// FlagExtraThemes
 	// Enables extra themes
 	FlagExtraThemes = "extraThemes"