Automatic merge from submit-queue (batch tested with PRs 38076, 38137, 36882, 37634, 37558)

Allow backendpools in Azure Load Balancers which are not owned by cloud provider

**What this PR does / why we need it**: It fixes #36880

**Which issue this PR fixes**: fixes #36880

**Special notes for your reviewer**:

**Release note**:
```release-note
Allow backendpools in Azure Load Balancers which are not owned by cloud provider
```

Instead of bailing out when we find another backend pool, we just ignore
other backend pools and add ours to the list of existing.

Fixes #36880