Updates to create job to handle scheduling

- If the job JSON contains a scheduling date then the new 'job_status" column is set to "scheduled"
- the date is persisted on the JOB row in the database
- Also the job WILL NOT be placed onto the queue of jobs. This is deferred to a later celery beat task.

tests/app/notifications/test_rest.py

@@ -1,4 +1,3 @@
-from datetime import datetime, timedelta
 import uuid
 
 import pytest