Automatic merge from submit-queue (batch tested with PRs 65902, 65781). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

if loadbalancer section is not defined in cloudconfig, do not init support

**What this PR does / why we need it**: if LoadBalancer section is not defined in cloudconfig, we should not initialize loadbalancer support for openstack cloudprovider.

**Which issue(s) this PR fixes**:
Fixes #65775

**Special notes for your reviewer**:

**Release note**:
```release-note
If LoadBalancer is not defined in cloud config, the loadbalancer is not initialized anymore in openstack. All setups must have some setting under that section
```