Only show reroute migration dialog when native reroute is not present (#3318)

src/utils/migration/migrateReroute.ts

@@ -28,6 +28,15 @@ export function findLegacyRerouteNodes(
   ) as RerouteNode[]
 }
 
+/**
+ * Checks if the workflow has no native reroutes
+ */
+export function noNativeReroutes(workflow: WorkflowJSON04): boolean {
+  return (
+    !workflow.extra?.reroutes?.length && !workflow.extra?.linkExtensions?.length
+  )
+}
+
 /**
  * Gets the center position of a node
  */