azure-powershell Generate 2022 04 01 desktopvirtualization

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Description

generated powershell modules for desktopvirtualization api version 2022-04-01-preview and updated modules and tests for scalingplan and scalingplanpooledschedule accordingly

Checklist

[ X] Check this box to confirm: I have read the Submitting Changes section of CONTRIBUTING.md and reviewed the following information:

SHOULD select appropriate branch. Cmdlets from Autorest.PowerShell should go to generation branch.
SHOULD make the title of PR clear and informative, and in the present imperative tense.
SHOULD update ChangeLog.md file(s) appropriately
- 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 in the past tense. Add changelog in description section if PR goes into generation branch.
- Should not change ChangeLog.md if no new release is required, such as fixing test case only.
SHOULD have approved design review for the changes in this repository (Microsoft internal only) with following situations
- Create new module from the scratch
- Create new resource types which are not easy to conform to Azure PowerShell Design Guidelines
- Create new resource type which name doesn't use module name as prefix
- Have design question before implementation
SHOULD regenerate markdown help files if there is cmdlet API change. Instruction
SHOULD have proper test coverage for changes in pull request.
SHOULD NOT introduce breaking changes in Az minor release except preview version.
SHOULD NOT change version of module in pull request