test: randomize ordering of tests

What does this merge request do and why?

By randomly ordering the tests, the risk of surprising inter-test dependencies is reduced.

How to set up and validate locally

1. Check out to this merge request's branch.
2. Run make test and note the order changes each time.

Merge request checklist

• Tests added for new functionality. If not, please raise an issue to follow up.
• Documentation added/updated, if needed.