Add worker_task attribute to TelemetryService to avoid AttributeError

src/backend/base/langflow/services/telemetry/service.py

@@ -41,7 +41,7 @@ def __init__(self, settings_service: SettingsService):
 
         self.ot = OpenTelemetry(prometheus_enabled=settings_service.settings.prometheus_enabled)
         self.architecture: str | None = None
-
+        self.worker_task: asyncio.Task | None = None
         # Check for do-not-track settings
         self.do_not_track = (
             os.getenv("DO_NOT_TRACK", "False").lower() == "true" or settings_service.settings.do_not_track