Azure: Add ability to grab deallocated VMs

[BryanDim]

Sizing script seems to be incorrectly handling deallocated virtual machines reporting 0 disk size. The following line:

rubrik-sizing-scripts/CLOUD/Get-AzureSizingInfo.ps1

Line 492 in 6364a1a

$diskSizeGiB += [int]$osDisk.DiskSizeGB

needs to be replaced with Get-AzDisk which will fetch the real disk size.