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
f7352aeb61