Tests and CI for samples

### Is your feature request related to a problem? Please describe.

_No response_

### Describe the solution you'd like

It would be good to have tests written for all the samples, and to enforce tests for new samples, so that we can be sure they always work.

This would cut down on manual verification work needed when doing new releases of the various components.

IMO, it would be better to do this sooner rather than later, while the number of samples is relatively low.

Also, it seems this is where the extensions will go, and those also should be tested.

### Describe alternatives you've considered

_No response_

### Additional context

_No response_

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct