[DAILY AGS] Implement daily job

# pseudo-code


Fetch distinct users from user_daily_notifications(date): user_id[]
For every user_id in user_ids:
    var notifications[]

    Fetch user_daily_notifications(user_id, date): {user_id, date, notification_id}[]
    For each notification in user_daily_notifications:
        Fetch notification(id)
        # Future: Check is not processed yet
        Append to notifications
    
    Send to queue {user_id, notifications}

    For each notification in user_daily_notifications:
        Delete entry from DB after processing
    
# Only delete after sending to avoid deleting before sending to queue
# Error handling, to avoid duplicates: when we have a db to track notification status, we should verify notification is not processed before before appending to notifications

More info: https://codimd.web.cern.ch/LtipSj4_RDmBvz3hWJed2Q?view#Option-2