Investigate tooling solutions for billing entity change

Problem

Detail description of problem and examples can be found in this related issue: https://gitlab.com/gitlab-org/fulfillment-meta/-/issues/537+

To summarise manual actions required by Support:

1. Create an order from Zuora - use when an order does not exist in cdot for a subscription in Zuora
2. Copy Zuora values to subscription in cdot - use when the order has the subscription number, but a number of nil values (especially product plan)
3. Generate a cloud license