[Don't Merge!][SecureString] [Autorest-based][Az.App] Final Change

[YanaXu]

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
  • For SDK-based development mode, 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.
  • For autorest-based development mode, include the changelog in the PR description.
  • 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]

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[github-actions]

‼️ DO NOT MERGE THIS PR ‼️
This PR was labeled "Do Not Merge" because it contains code change that cannot be merged. Please contact the reviewer for more information.

[github-actions]

To improve dev experience and reduce maintenance efforts, we are deprecating branch: generation now. Azure-PowerShell modules generated by autorest.powershell no longer target branch generation, and will be targeting directly to main instead.

Please find migration guide and document below:

• If you have open PR or on going development
• If you are about to start new development and have prior experience
• Starting from scratch