Automatic merge from submit-queue (batch tested with PRs 51235, 50819, 51274, 50972, 50504)

Support for specifying external LoadBalancerIP on openstack

1. Support ServiceAnnotationLoadBalancerFloatingNetworkId for LB v1

2. Support for specifying external LoadBalancerIP on openstack
    Add ServiceAnnotationLoadBalancerInternal annotation to distinguish
    between internal LoadBalancerIP and external LoadBalancerIP.


**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
Fix #50851 

**Release note**:
```release-note
NONE
```