[ReleasePR orbital] [Hub Generated] Publish private branch 'dev-orbital-Microsoft.Orbital-2021-04-04-preview' (#2340)

Create to sync Azure/azure-rest-api-specs#18551
[ReCreate this PR](https://github.com/azure-resource-manager-schemas/compare/main...azure-sdk:sdkAuto/orbital?expand=1)

Author: msftbot[bot]