Preannournce BC in AKS sku

[isra-fel]

Description

Preannounce breaking change in New-AzAksCluster with the -NodeVmSize parameter. Preview:

WARNING: Upcoming breaking changes in the cmdlet 'New-AzAksCluster' :
The default value of -NodeVmSize will be changing from 'Standard_DS2_V2 (Linux), Standard_DS2_V3 (Windows)' to being dynamically selected by the AKS resource provider based on quota and capacity.
- The change is expected to take effect in Az version : '14.0.0'
- The change is expected to take effect in Az.Aks version : '7.0.0'
Note : Go to https://aka.ms/azps-changewarnings for steps to suppress this breaking change warning, and other information on breaking changes in Azure PowerShell.

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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