Az.CloudService update generation tool version: autorest.powershell v3->v4

[lijinpei2008]

…3->v4

Description

Mandatory Checklist

• Please choose the target release of Azure PowerShell. (⚠️Target release is a different concept from API readiness. Please click below links for details.)

  • [ ] General release
  • [ ] Public preview
  • [ ] Private preview
  • [ ] Engineering build
  • [ ] No need for a release

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

• SHOULD update ChangeLog.md file(s) appropriately
  • Update 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.
  • Should not change ChangeLog.md if no new release is required, such as fixing test case only.
• SHOULD regenerate markdown help files if there is cmdlet API change. Instruction
• SHOULD have proper test coverage for changes in pull request.
• SHOULD NOT adjust version of module manually in pull request

[azure-client-tools-bot-prd[bot]]

Thanks for your contribution! The pull request validation has started. Please revisit this comment for updated status.

[github-actions[bot]]

To the author of the pull request, This PR was labeled "Breaking Change Release" because it contains breaking changes.

• According to our policy, breaking changes can only take place during major release and they must be preannounced.
• Please follow our guide on the detailed steps.
• [ ] Required: Please fill in the task below to facilitate our contact,you will receive notifications related to breaking changes.

[VeryEarly]

-Roleinstance should not be optional in general because it's path parameter

[github-actions[bot]]

This PR was labeled "needs-revision" because it has unresolved review comments or CI failures. Please resolve all open review comments and make sure all CI checks are green. Refer to our guide to troubleshoot common CI failures.