Add additional modules to celery.autodiscover_tasks() (#2607)

# Description

Please include a summary of the changes and the related issue. Please
also include relevant motivation and context.

## Checklist before requesting a review

Please delete options that are not relevant.

- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented hard-to-understand areas
- [ ] I have ideally added tests that prove my fix is effective or that
my feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged

## Screenshots (if appropriate):

backend/celery_config.py

@@ -38,4 +38,4 @@
     raise ValueError(f"Unsupported broker URL: {CELERY_BROKER_URL}")
 
 
-celery.autodiscover_tasks(["modules.sync"])
+celery.autodiscover_tasks(["modules.sync", "modules", "middlewares", "packages"])