Set-AzVMOperatingSystem PatchMode and EnableHotPatching parameters

[Sandido]

Azure/azure-powershell-cmdlet-review-pr#829
Azure/azure-powershell-cmdlet-review-pr#830

Swagger PR: Azure/azure-rest-api-specs#12334
.Net SDK PR: Azure/azure-sdk-for-net#18498

Work for:
https://msazure.visualstudio.com/One/_workitems/edit/9294531
https://msazure.visualstudio.com/One/_workitems/edit/9294548

Description

Checklist

• I have read the Submitting Changes section of CONTRIBUTING.md
• The title of the PR is clear and informative
• The appropriate ChangeLog.md file(s) has been updated:
  • For any service, the ChangeLog.md file can be found at src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md
  • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header -- no new version header should be added
• The PR does not introduce breaking changes
• If applicable, the changes made in the PR have proper test coverage
• For public API changes to cmdlets:
  • a cmdlet design review was approved for the changes in this repository (Microsoft internal only)
    • {Please put the link here}
  • the markdown help files have been regenerated using the commands listed here