[ReleasePR labservices] [Hub Generated] Review request for Microsoft.LabServices to add version preview/2021-10-01-preview (#1907)

Create to sync Azure/azure-rest-api-specs#15939
[ReCreate this PR](https://github.com/azure-resource-manager-schemas/compare/main...AzureSDKAutomation:sdkAuto/labservices?expand=1)

Author: msftbot[bot]