Automatic merge from submit-queue (batch tested with PRs 66225, 66648, 65799, 66630, 66619). 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>.

Update Azure Go SDK to v19.0.0 and get availability zone for VirtualMachineScaleSetVM

**What this PR does / why we need it**:

Continue of #66242. This PR updates Azure Go SDK to v19.0.0 (with compute API 2018-04-01) and gets availability zones for VirtualMachineScaleSetVM.

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

**Special notes for your reviewer**:

**Release note**:

```release-note
Azure Go SDK has been upgraded to v19.0.0 and VirtualMachineScaleSetVM now supports availability zones.
```

/sig azure
/assign @brendandburns @khenidak @andyzhangx