Type Mismatch: VirtualMachineScaleSet.virtualMachineProfile.storageProfile.diskControllerType: string vs string[]

The Azure Rest API expects and returns a `string` value for the `diskControllerType` option on the storage profile for VM Scaleset VM profiles.

Documentation can be found here: https://github.com/Azure/azure-rest-api-specs/blob/main/specification/compute/resource-manager/Microsoft.Compute/ComputeRP/stable/2023-03-01/virtualMachineScaleSet.json#L4092

Public facing documentation specifies that this value should instead be a `string[]`: https://learn.microsoft.com/en-us/rest/api/compute/virtual-machine-scale-sets/create-or-update?tabs=HTTP#virtualmachinescalesetstorageprofile

As a result, downstream tools (Pulumi's azure-native provider) provide / expect a string array - and encounter an error when a string is provided back, or the provided string array is rejected.

Related Issue: https://github.com/pulumi/pulumi-azure-native/issues/2639

Inspect the virtualMachineScaleSet.json specification at the linked diskControllerType definition, then compare it with the public REST documentation and the related Pulumi issue. Done means the specification and published documentation agree on whether this value is a string or an array, eliminating the downstream type mismatch.

Written by the indexing model from the issue text.