fix default parameter for Placement Feature in New-AzVM

[grizzlytheodore]

Description

addressing bug found: #27855

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]

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[Copilot]

Pull Request Overview

This PR ensures that the new Placement property on the VM model is populated in the DefaultExecuteCmdlet method of New-AzVM.

• Added Placement = this.VM.Placement to the VM object initializer.
• Adjusted trailing comma on the previous line for proper formatting.

Comments suppressed due to low confidence (2)

src/Compute/Compute/VirtualMachine/Operation/NewAzureVMCommand.cs:1165

• There are no existing tests covering the new Placement mapping. Please add unit or integration tests to verify that the Placement parameter is correctly passed through to the VM model.

Placement = this.VM.Placement

src/Compute/Compute/VirtualMachine/Operation/NewAzureVMCommand.cs:1165

• Remember to update the ChangeLog.md under src/Compute/Compute/ChangeLog.md with a note about the new Placement feature and regenerate the markdown help files so the new parameter appears in the public docs.

Placement = this.VM.Placement

[msJinLei]

LGTM