Automatic merge from submit-queue (batch tested with PRs 67061, 66589, 67121, 67149). 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>.

Get load balancer name per provider

**What this PR does / why we need it**:
GetLoadBalancerName() should be implemented per cloud provider as opposed to one neutral implementation.

This PR will address this by moving `cloudprovider.GetLoadBalancerName()` to the `LoadBalancer interface` and then provide an implementation for each cloud provider, while maintaining previously expected functionality.

**Which issue(s) this PR fixes**:
Fixes  [#43173](https://github.com/kubernetes/kubernetes/issues/43173)

**Special notes for your reviewer**:
This is a work in progress. Looking for feedback as I work on this, from any interested parties.

**Release note**:

```release-note
NONE
```