CodeGen from PR 19482 in Azure/azure-rest-api-specs

[Hub Generated] Review request for Microsoft.Maintenance to add version preview/2022-07-01-preview (#19482)

* Adds base for updating Microsoft.Maintenance from version preview/2021-09-01-preview to version 2022-07-01-preview

* Updates readme

* Updates API version in new specs and examples

* Adding Resource as Maintenance Scope for Maintenance Configuration APIs.

Co-authored-by: Paul Selvaraj <paulse@microsoft.com>

Author: SDKAuto