Specifies the service artifact reference id used to set same image version for all virtual machines in the scale set when using 'latest' image version.
The service artifact reference id in the form of /subscriptions/{subscriptionId}/resourceGroups/{resourceGroup}/providers/Microsoft.Compute/galleries/{galleryName}/serviceArtifacts/{serviceArtifactName}/vmArtifactsProfiles/{vmArtifactsProfilesName}