Revert "Reinstating the 2 task model for API submitted notifications."

This reverts commit 1c154c4113.

app/celery/tasks.py

@@ -123,39 +123,6 @@ def process_row(row_number, recipient, personalisation, template, job, service):
     )
 
 
-def send_notification_to_persist_queue(
-        notification_id, service, template_type, encrypted, priority=False, research_mode=False
-):
-    queues = {
-        SMS_TYPE: 'db-sms',
-        EMAIL_TYPE: 'db-email'
-    }
-
-    send_fns = {
-        SMS_TYPE: send_sms,
-        EMAIL_TYPE: send_email
-    }
-
-    send_fn = send_fns[template_type]
-
-    if research_mode:
-        queue_name = "research-mode"
-    elif priority:
-        queue_name = "notify"
-    else:
-        queue_name = queues[template_type]
-
-    send_fn.apply_async(
-        (
-            str(service.id),
-            notification_id,
-            encrypted,
-            datetime.utcnow().strftime(DATETIME_FORMAT)
-        ),
-        queue=queue_name
-    )
-
-
 def __sending_limits_for_job_exceeded(service, job, job_id):
     total_sent = fetch_todays_total_message_count(service.id)