[azure] Installer doesn't validate diskType on ASH which lead to install fails with unsupported disktype

IPI install on azure stack failed when setting platform.azure.osDiks.diskType as StandardSSD_LRS in install-config.yaml.

When setting controlPlane.platform.azure.osDisk.diskType as StandardSSD_LRS, get error in terraform log and some resources have been created.

level=error msg=Error: expected storage_os_disk.0.managed_disk_type to be one of [Premium_LRS Standard_LRS], got StandardSSD_LRS
level=error
level=error msg=  with azurestack_virtual_machine.bootstrap,
level=error msg=  on main.tf line 107, in resource "azurestack_virtual_machine" "bootstrap":
level=error msg= 107: resource "azurestack_virtual_machine" "bootstrap" {
level=error
level=error msg=failed to fetch Cluster: failed to generate asset "Cluster": failure applying terraform for "bootstrap" stage: failed to create cluster: failed to apply Terraform: exit status 1
level=error
level=error msg=Error: expected storage_os_disk.0.managed_disk_type to be one of [Premium_LRS Standard_LRS], got StandardSSD_LRS
level=error
level=error msg=  with azurestack_virtual_machine.bootstrap,
level=error msg=  on main.tf line 107, in resource "azurestack_virtual_machine" "bootstrap":
level=error msg= 107: resource "azurestack_virtual_machine" "bootstrap" {
level=error
level=error

When setting compute.platform.azure.osDisk.diskType as StandardSSD_LRS, fail to provision compute machines

$ oc get machine -n openshift-machine-api
NAME                                     PHASE     TYPE              REGION   ZONE   AGE
jima414ash03-xkq5x-master-0              Running   Standard_DS4_v2   mtcazs          62m
jima414ash03-xkq5x-master-1              Running   Standard_DS4_v2   mtcazs          62m
jima414ash03-xkq5x-master-2              Running   Standard_DS4_v2   mtcazs          62m
jima414ash03-xkq5x-worker-mtcazs-89mgn   Failed                                      52m
jima414ash03-xkq5x-worker-mtcazs-jl5kk   Failed                                      52m
jima414ash03-xkq5x-worker-mtcazs-p5kvw   Failed                                      52m

$ oc describe machine jima414ash03-xkq5x-worker-mtcazs-jl5kk -n openshift-machine-api
...
  Error Message:           failed to reconcile machine "jima414ash03-xkq5x-worker-mtcazs-jl5kk": failed to create vm jima414ash03-xkq5x-worker-mtcazs-jl5kk: failure sending request for machine jima414ash03-xkq5x-worker-mtcazs-jl5kk: cannot create vm: compute.VirtualMachinesClient#CreateOrUpdate: Failure sending request: StatusCode=400 -- Original Error: Code="InvalidParameter" Message="Storage account type 'StandardSSD_LRS' is supported by Microsoft.Compute API version 2018-04-01 and above" Target="osDisk.managedDisk.storageAccountType"
...

Based on azure-stack doc[1], supported disk types on ASH are Premium SSD, Standard HDD. It's better to do validation for diskType on Azure Stack to avoid above errors.

[1]https://learn.microsoft.com/en-us/azure-stack/user/azure-stack-managed-disk-considerations?view=azs-2206&tabs=az1%2Caz2#cheat-sheet-managed-disk-differences

4.14.0-0.nightly-2023-05-16-085836

Always

1. Prepare install-config.yaml, set platform.azure.osDiks.diskType as StandardSSD_LRS
2. Install IPI cluster on Azure Stack
3.

Installation failed

Installer validate diskType on AzureStack Cloud, and exit for unsupported disk type with error message