Add Robert Les/StatComparisons tests to StatAnalysis CI/CD
Adding @rles work on statistics tests to StatAnalysis, either we:
- Copy the relevant code from the StatComparisons repo into StatAnalysis
- Keep the StatComparisons repo as is, and activate the CI there somehow from the CI here.
The latter might not be easy to do with Gitlab, we should look into that first. If it is not easily doable we go to the first option.