feat: update Celery worker configuration and improve connector deletion process

- Added support for multiple queues in Celery worker configuration.
- Modified connector deletion to handle documents inline instead of using a background task.
- Updated response messages for document creation and connector deletion to reflect new processing status.
- Removed the obsolete connector deletion Celery task file.

.vscode/launch.json

@@ -71,6 +71,7 @@
                 "app.celery_app:celery_app",
                 "worker",
                 "--loglevel=info",
+                "--queues=surfsense,surfsense.connectors,surfsense-dev,surfsense-dev.connectors",
                 "--pool=solo"
             ],
             "console": "integratedTerminal",