{AKS} fix test case when AGIC with Azure CNI Overlay

[robogatikov]

---

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When Ingress Appgateway Addon is enabled in Azure CNI Overlay cluster and --uppgw-subnet-cidr is specified on cluster create, the cidr should be shorter than /24.

Related command

az aks create

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[azure-client-tools-bot-prd]

️✔️Azure CLI Extensions Breaking Change Test

️✔️Non Breaking Changes

[azure-client-tools-bot-prd]

Hi @robogatikov,
Please write the description of changes which can be perceived by customers into HISTORY.rst.
If you want to release a new extension version, please update the version in setup.py as well.

[Copilot]

Pull Request Overview

This PR updates an existing test to align with the requirement that the App Gateway subnet CIDR must be shorter than /24 when AGIC is enabled in an Azure CNI Overlay cluster.

• Changed the --appgw-subnet-cidr value from /16 to /26 in the test command.
• Updated the expected assertion for the subnetCIDR check to /26.

[yonzhan]

Thank you for your contribution! We will review the pull request and get back to you soon.

[github-actions]

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[github-actions]

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[FumingZhang]

Queued live test to validate the change, test passed!

• test_aks_create_with_ingress_appgw_addon