Integrate RNG check into Tests/CI

[DavidKerkmann]

Motivation / Current Behaviour

To check consistency of the RNG, especially across multiple platforms, we are missing a test that confirms that we always obtain the same results given a fixed seed.

Enhancement description

A simple check could be to set up a fixed seed and compare the first few drawn numbers to the expected values.

Additional context

No response

Checklist

• Attached labels, especially loc:: or model:: labels.
• Linked to project