[ENHANCEMENT] added methods to retrieve portals and urls from WebspaceManager

__Tasks:__

- [x] test coverage
- [ ] gather feedback for my changes


__Informations:__

| Q             | A
| ------------- | ---
| Tests pass?   | yes
| Fixed tickets | none
| BC Breaks     | none
| Doc           | none
True, but I would not do that in that PR... Can you maybe add an issue for that?