[azure] Fail to create master node with vm size in family ECIADSv5 and ECIASv5

Deploy IPI cluster on azure cloud, set region as westeurope, vm size as EC96iads_v5 or EC96ias_v5. Installation fails with below error:

12-15 11:47:03.429  level=error msg=Error: creating Linux Virtual Machine: (Name "jima-15a-m6fzd-bootstrap" / Resource Group "jima-15a-m6fzd-rg"): compute.VirtualMachinesClient#CreateOrUpdate: Failure sending request: StatusCode=400 -- Original Error: Code="BadRequest" Message="The VM size 'Standard_EC96iads_v5' is not supported for creation of VMs and Virtual Machine Scale Set with '<NULL>' security type."

Similar as https://bugzilla.redhat.com/show_bug.cgi?id=2055247.

From azure portal, we can see that the type of both vm size EC96iads_v5 and EC96ias_v5 are confidential compute.

Might also need to do similar process for them as what did in bug 2055247.

4.12 nightly build

Always

1. Prepare install-config.yaml file, set region as westeurope, vm size as EC96iads_v5 or EC96ias_v5
2. Deploy IPI azure cluster
3.

Install failed with error in description

Installer should be exited during validation and show expected error message.