##### SUMMARY
The vswitch subnet validation changed: the subnet ip_range must be
smaller than the network ip_range **AND** must not start with the same
IP.
See
https://github.com/ansible-collections/hetzner.hcloud/runs/17672011247
In addition, I reworked the tests to use the new testing framework.
##### SUMMARY
- Implement the new testing framework (prepare.yml/cleanup.yml #239)
- Fix some uncovered test scenarios (related to #298).
- Structure all the *_info tests using the following structure:
```
gather all
[gather all with custom options...]
gather all in check mode
gather with id
gather with name
gather with labels
[gather with custom option...]
```
