Private Preview: Enable Trusted launch on existing Virtual machine Flex scale set

Announcing preview support to enable Trusted launch on existing Virtual machine Flex scale set by upgrading the scale set resource to Gen2-Trusted launch. This will help improve the foundational security of existing Azure Virtual machine Flex scale set resources.  

Trusted Launch VMs provide foundational compute security to Azure Generation 2 VMs by enabling Secure Boot and vTPM capabilities. Trusted Launch capabilities protect OS against rootkits, boot kits and enables attestation by measuring the boot chain of VM.  

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