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Improve Azure disk operations for vmas and vmss

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

Today, VirtualMachineScaleSetVM and VirtualMachine are different data structures (because of different API versions), so the disk attach operation seems duplicate between vm and vmss. That means although disk operations are in same logic, some duplication is required then.

With #63063, they are using the same API now. This PR improves Azure disk operations by adding another `GetDataDisks()` interface in vmSet and moving common logics to controllerCommon.

**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 #59736

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```