azurerm_linux_virtual_machine azurerm_windows_virtual_machine: Add support for confidential vm

[myc2h6o]

• Support Confidential VM, two new properties under os_disk: security_encryption_type to specify the encryption type of the os disk when it's a confidential vm, and secure_vm_disk_encryption_set_id to specify the disk encryption set if CMK is used. Property names are taken from Confidential Compute CLI Change Request - VM / VMSS Create Azure/azure-cli#22199 per service team to keep the user experience consistent.
• As confidential vm requires vtpm and secure_boot to be enabled, error will be thrown if they are not set to true when security_encryption_type is specified.
• Similar to TrustedLaunch, value of VirtualMachineProperties.SecurityProfile.SecurityType could be decided and set to ConfidentialVM when security_encryption_type is specified.

[myc2h6o]

Test result of TestAccLinuxVirtualMachine_|TestAccWindowsVirtualMachine_ (Failed tests fail on main for same reason):

[WodansSon]

@myc2h6o thank you for this PR... LGTM... 🚀

[github-actions]

This functionality has been released in v3.8.0 of the Terraform Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

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[github-actions]

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