Update create job form for scheduling

[ellisonbg]

Problem

We are currently in the process of adding the ability for users to run jobs automatically on a schedule. This issue is to describe and track work needed to enable scheduling on the create job form. The core user story here is this:

"As a user, I would like to create a job to run automatically on a schedule"

Proposed Solution

• Add UI to the create job view that allows a user to pick between "run now" and "schedule".
• When a user picks "schedule" offer two options:
  • A simplified, graphical UI for specifying a schedule.
  • Full CRON expression syntax for advanced usage cases.
• When a user create the job definition, take them to the list view, but with the job definitions table show.