Previews: remove dashboard previews backend (#66176)

* remove dashboard previews backend

* remove dashboard previews backend

* bring back the migration

* bring back the migration

* bring back the migration

pkg/services/featuremgmt/registry.go

@@ -27,12 +27,6 @@ var (
 			State:       FeatureStateStable,
 			Owner:       hostedGrafanaTeam,
 		},
-		{
-			Name:        "dashboardPreviews",
-			Description: "Create and show thumbnails for dashboard search results",
-			State:       FeatureStateAlpha,
-			Owner:       grafanaAppPlatformSquad,
-		},
 		{
 			Name:         "live-service-web-worker",
 			Description:  "This will use a webworker thread to processes events rather than the main thread",

pkg/services/featuremgmt/toggles_gen.csv

@@ -2,7 +2,6 @@ Name,State,Owner,requiresDevMode,RequiresLicense,RequiresRestart,FrontendOnly
 trimDefaults,beta,@grafana/grafana-as-code,false,false,false,false
 disableEnvelopeEncryption,stable,@grafana/grafana-as-code,false,false,false,false
 database_metrics,stable,@grafana/hosted-grafana-team,false,false,false,false
-dashboardPreviews,alpha,@grafana/grafana-app-platform-squad,false,false,false,false
 live-service-web-worker,alpha,@grafana/grafana-app-platform-squad,false,false,false,true
 queryOverLive,alpha,@grafana/grafana-app-platform-squad,false,false,false,true
 panelTitleSearch,beta,@grafana/grafana-app-platform-squad,false,false,false,false

pkg/services/featuremgmt/toggles_gen.go

@@ -19,10 +19,6 @@ const (
 	// Add Prometheus metrics for database tables
 	FlagDatabaseMetrics = "database_metrics"
 
-	// FlagDashboardPreviews
-	// Create and show thumbnails for dashboard search results
-	FlagDashboardPreviews = "dashboardPreviews"
-
 	// FlagLiveServiceWebWorker
 	// This will use a webworker thread to processes events rather than the main thread
 	FlagLiveServiceWebWorker = "live-service-web-worker"

pkg/services/featuremgmt/usage_stats_test.go

@@ -11,7 +11,6 @@ func TestFeatureUsageStats(t *testing.T) {
 	featureManagerWithAllFeatures := WithFeatures(
 		"trimDefaults",
 		"database_metrics",
-		"dashboardPreviews",
 		"live-config",
 		"UPPER_SNAKE_CASE",
 		"feature.with.a.dot",
@@ -20,7 +19,6 @@ func TestFeatureUsageStats(t *testing.T) {
 	require.Equal(t, map[string]interface{}{
 		"stats.features.trim_defaults.count":      1,
 		"stats.features.database_metrics.count":   1,
-		"stats.features.dashboard_previews.count": 1,
 		"stats.features.live_config.count":        1,
 		"stats.features.upper_snake_case.count":   1,
 		"stats.features.feature_with_a_dot.count": 1,