Automatic merge from submit-queue

openstack: Autodetect LBaaS v1 vs v2

```release-note
* openstack: autodetect LBaaS v1/v2 by querying for available extensions.  For most installs, this effectively changes the default from v1 to v2.  Existing installs can add "lb-version = v1" to the provider config file to continue to use v1.
```

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.kubernetes.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.kubernetes.io/reviews/kubernetes/kubernetes/29726)
<!-- Reviewable:end -->