Alerting: Update alerting cue definitions (#104053)

Co-authored-by: Yuri Tseretyan <yuriy.tseretyan@grafana.com>

apps/alerting/notifications/kinds/routingtree.cue

@@ -1,49 +1,25 @@
-package core
+package kinds
 
-route: {
-	kind:  "RoutingTree"
-	group: "notifications"
+import (
+	"github.com/grafana/grafana/apps/alerting/notifications/kinds/v0alpha1"
+)
+
+routeTree: {
+	kind: "RoutingTree"
 	apiResource: {
 		groupOverride: "notifications.alerting.grafana.app"
 	}
-	codegen: {
-		frontend: false
-		backend:  true
-	}
 	pluralName: "RoutingTrees"
 	current:    "v0alpha1"
+	codegen: {
+		ts: {enabled: false}
+		go: {enabled: true}
+	}
 	versions: {
 		"v0alpha1": {
 			schema: {
-				#RouteDefaults: {
-					receiver: string
-					group_by?: [...string]
-					group_wait?: string
-					group_interval?:  string
-					repeat_interval?: string
-				}
-				#Matcher: {
-					 type: "=" |"!="|"=~"|"!~" @cuetsy(kind="enum")
-					 label: string
-					 value: string
-				}
-				#Route: {
-					receiver?: string
-					matchers?: [...#Matcher]
-					continue: bool
-
-					group_by?: [...string]
-					mute_time_intervals?: [...string]
-					routes?: [...#Route]
-					group_wait?: string
-					group_interval?:  string
-					repeat_interval?: string
-				}
-				spec: {
-					 defaults: #RouteDefaults
-					 routes: [...#Route]
-				}
+				spec: v0alpha1.RouteTreeSpec
 			}
 		}
 	}
-}
+}