Add convenience commands to display URLs for mlflow and notebooks

### Why it needs to get done

To connect to mlflow or a dss notebook, we can follow the ClusterIP:Port of the service. You can get these from `kubectl get svc -n dss`, but we should make it easier.

The initial [spec](https://docs.google.com/document/d/1v0wU8TBb-ui6RcjGRbLwA6XFZnWbuiVb2TPmEgwKejY/edit) for this tool has `dss create-notebook` (no args) listing the available notebooks, but this feels awkward. An alternative would be a dedicated command (`dss list-notebooks`, and something similar for mlflow? Or maybe a general `dss list-resources` that shows both mlflow and notebooks?). Whatever is implemented, it should have clickable links for all the resources

### What needs to get done

1. implement a convenience function to see all notebook/mlflow endpoints

### When is the task considered done

see above