Duplicate "refNo" lead to errors when using multiple environments

Problem/Motivation

Since the refNo is order->id() when submitting to Datatrans, the mapping between Datatrans Transactions and Drupal Orders breaks, when multiple developers have different DB states / different order ids.

Steps to reproduce

Have an environment and settle a payment for order 1.

Have a second environment and settle a payment for order 1.

Proposed resolution

Use the UUID of the order instead.

Remaining tasks

- [ ] Update the Notify Route Controller and the DatatransBase to use the UUID instead

User interface changes

/

API changes

- Use UUID of the Order as the "refNo" field for Datatrans internally

Data model changes

/