[ReleasePR machinelearningservices] [Hub Generated] Review request for Microsoft.MachineLearningServices to update version preview/2021-03-01-preview with new enum values (#2343)

Create to sync Azure/azure-rest-api-specs#18690
[ReCreate this PR](https://github.com/azure-resource-manager-schemas/compare/main...azure-sdk:sdkAuto/machinelearningservices?expand=1)

Author: msftbot[bot]