Alerting: Create feature toggle for provisioning (#47167)

* Create feature flag for alerting provisioning

* Fix tabs for golint compliance

pkg/services/featuremgmt/registry.go

@@ -1,3 +1,8 @@
+// To change feature flags, edit:
+//  pkg/services/featuremgmt/registry.go
+// Then run tests in:
+//  pkg/services/featuremgmt/toggles_gen_test.go
+
 package featuremgmt
 
 var (
@@ -178,6 +183,11 @@ var (
 			Description: "Configurable storage for dashboards, datasources, and resources",
 			State:       FeatureStateAlpha,
 		},
+		{
+			Name:        "alertProvisioning",
+			Description: "Provisioning-friendly routes for alerting",
+			State:       FeatureStateAlpha,
+		},
 		{
 			Name:            "storageLocalUpload",
 			Description:     "allow uploads to local storage",