improve batch completion system for run engine v1

Author: ericallam

apps/webapp/app/routes/api.v1.tasks.batch.ts

@@ -118,7 +118,7 @@ const { action, loader } = createActionApiRoute(
         return json({ error: error.message }, { status: 422 });
       } else if (error instanceof Error) {
         return json(
-          { error: error.message },
+          { error: "Something went wrong" },
           { status: 500, headers: { "x-should-retry": "false" } }
         );
       }