Order Status: Align POL Payment and Receipt status with PO Status when opening order

Purpose: To avoid confusion and possible errors in receipt and invoicing while processing orders.

Scenario 1:
Given an order has been created with one or more POLs
When Order status is pending
Then POL receipt and payment status can only be set to "Pending" or "Payment/Receipt Not Required"

Scenario 2: it's purely back-end work (MODORDERS-211)
Given an order has been created with one or more POLs
When Order status is Open
Then POL receipt and payment status is not "pending"
And by default would be "Awaiting Payment" and "Awaiting Receipt" respectively