scheduler: fix perm diff on appEngineRouting

Signed-off-by: Modular Magician <magic-modules@google.com>

google-beta/resource_cloud_scheduler_job.go

@@ -634,33 +634,17 @@ func flattenCloudSchedulerJobAppEngineHttpTargetHttpMethod(v interface{}, d *sch
 	return v
 }
 
+// An `appEngineRouting` filed of CloudScheduler API only contains output-only `host` field,
+// so we set config values rather than api response to state.
+// https://cloud.google.com/scheduler/docs/reference/rest/v1/projects.locations.jobs#AppEngineRouting
 func flattenCloudSchedulerJobAppEngineHttpTargetAppEngineRouting(v interface{}, d *schema.ResourceData) interface{} {
 	if v == nil {
 		return nil
 	}
-	original := v.(map[string]interface{})
-	if len(original) == 0 {
-		return nil
+	if targets := d.Get("app_engine_http_target").([]interface{}); len(targets) > 0 {
+		return targets[0].(map[string]interface{})["app_engine_routing"]
 	}
-	transformed := make(map[string]interface{})
-	transformed["service"] =
-		flattenCloudSchedulerJobAppEngineHttpTargetAppEngineRoutingService(original["service"], d)
-	transformed["version"] =
-		flattenCloudSchedulerJobAppEngineHttpTargetAppEngineRoutingVersion(original["version"], d)
-	transformed["instance"] =
-		flattenCloudSchedulerJobAppEngineHttpTargetAppEngineRoutingInstance(original["instance"], d)
-	return []interface{}{transformed}
-}
-func flattenCloudSchedulerJobAppEngineHttpTargetAppEngineRoutingService(v interface{}, d *schema.ResourceData) interface{} {
-	return v
-}
-
-func flattenCloudSchedulerJobAppEngineHttpTargetAppEngineRoutingVersion(v interface{}, d *schema.ResourceData) interface{} {
-	return v
-}
-
-func flattenCloudSchedulerJobAppEngineHttpTargetAppEngineRoutingInstance(v interface{}, d *schema.ResourceData) interface{} {
-	return v
+	return nil
 }
 
 func flattenCloudSchedulerJobAppEngineHttpTargetRelativeUri(v interface{}, d *schema.ResourceData) interface{} {