add the Tags field to VirtualMachineScaleSetVMProfile

### Feature Request <!-- To help us better serve you, describe the feature you'd like and how it will help you. Note that this is for SDK specific features. For Service API feature requests, use https://github.com/Azure/azure-rest-api-specs. --> VirtualMachineScaleSetVMProfile missing Tags, despite ARM API supporting it v7.1.0 added Tags to several related structs (VirtualMachineScaleSetNetworkConfiguration, VirtualMachineScaleSetPublicIPAddressConfiguration, etc.) but not to VirtualMachineScaleSetVMProfile. So the field simply isn't modeled in the Go SDK yet. The JSON injection approach remains the only way to set virtualMachineProfile.tags without dropping to raw REST.