CodeGen from PR 17506 in Azure/azure-rest-api-specs

[Hub Generated] Public private branch 'yuwzho/deprecate-appplatform-api-version' (#17506)

* Deprecate AppPlatform 2019-05-01-preview API version

* remove related SDK code

Co-authored-by: Yuchao Yan <yuchaoyan@microsoft.com>

Author: SDKAuto