CodeGen from PR 16557 in Azure/azure-rest-api-specs

[Hub Generated] Review request for Microsoft.LabServices to add version preview/2021-11-15-preview (#16557)

* Adds base for updating Microsoft.LabServices from version preview/2021-10-01-preview to version 2021-11-15-preview

* Updates readme

* Updates API version in new specs and examples

* add locations/usages resource

* fix usages id constraint to allow for empty string

* add skus resource and examples

* add integer format, fix quantity type from string to number

* fix readonly property per arm feedback

Co-authored-by: Nick Depinet <[email protected]>

Author: SDKAuto