Remove Dead Microsoft.Azure.Management.Attestation reference

[isra-fel]

Description

This reference is not meaningful and would produce a warning during build

Attestation netstandard2.0 succeeded with 1 warning(s) (1.6s) → artifacts/Debug/Az.Attestation/Microsoft.Azure.PowerShell.Cmdlets.Attestation.dll
    /usr/local/share/dotnet/sdk/10.0.100/Microsoft.Common.CurrentVersion.targets(2437,5): warning [MSB3245](https://go.microsoft.com/fwlink/?LinkId=MSBuild.ResolveAssemblyReference.FailedToResolveReference): Could not resolve this reference. Could not locate the assembly "Microsoft.Azure.Management.Attestation". Check to make sure the assembly exists on disk. If this reference is required by your code, you may get compilation errors.

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 cleans up the Az.Attestation module project file by removing a dead/unused assembly reference (Microsoft.Azure.Management.Attestation) that fails to resolve and generates MSBuild warning MSB3245 during builds.

Changes:

• Removed the <Reference Include="Microsoft.Azure.Management.Attestation" /> entry from the Attestation.csproj to eliminate an unresolved reference warning.