[Keyvault] add breaking change attribute for GetAzureKeyVaultSecret and GetAzureKeyVaultKey

[DanielMicrosoft]

Description

Breaking notification attributes added for GetAzureKeyVaultSecret and GetAzureKeyVaultKey.

Changes will be implemented in #29015

And relates to #26217.

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 adds breaking change notification attributes to two Key Vault cmdlets (Get-AzKeyVaultSecret and Get-AzKeyVaultKey) to inform users that certificate-backed secrets and keys will no longer be returned when listing these resources in a future release (version 16.0.0). This change prepares users for the breaking changes planned in PR #29015.

Changes:

• Added GenericBreakingChangeWithVersion attribute to GetAzureKeyVaultSecret class
• Added GenericBreakingChangeWithVersion attribute to GetAzureKeyVaultKey class
• Added necessary namespace import (Microsoft.WindowsAzure.Commands.Common.CustomAttributes) to both files

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/KeyVault/KeyVault/Commands/Secret/GetAzureKeyVaultSecret.cs	Added breaking change attribute and namespace import to notify users that certificate-backed secrets will no longer be returned when listing secrets
src/KeyVault/KeyVault/Commands/Key/GetAzureKeyVaultKey.cs	Added breaking change attribute and namespace import to notify users that certificate-backed keys will no longer be returned when listing keys

[vidai-msft]

Please update the change log.

[github-actions]

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[isra-fel]

LGTM cc @notyashhh

changelog updated