[AKS] az aks update: Set CMK property "enabled" to false and reserve other CMK properties for a PMK-enabled and CMK-disabled cluster

[bingosummer]

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[AbelHu]

LGTM. Thanks for the PR.

[Copilot]

Pull Request Overview

This PR updates the behavior when disabling Customer-Managed Keys (CMK) on Azure Kubernetes Service clusters to preserve CMK configuration properties rather than clearing them.

• Modified the KMS update logic to preserve existing CMK properties (key_id, key_vault_resource_id, key_vault_network_access) when setting enabled=False
• Updated tests to reflect the new behavior of retaining CMK configuration on disable
• Bumped version to 19.0.0b12

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
src/aks-preview/setup.py	Version bump from 19.0.0b11 to 19.0.0b12
src/aks-preview/HISTORY.rst	Added release notes for version 19.0.0b12 describing the CMK property preservation behavior
src/aks-preview/azext_aks_preview/managed_cluster_decorator.py	Removed initialization of empty AzureKeyVaultKms object to preserve existing CMK properties when disabling
src/aks-preview/azext_aks_preview/tests/latest/test_managed_cluster_decorator.py	Updated test expectations to verify CMK properties are preserved when disabled, added key_vault_network_access values to test data

[FumingZhang]

/azp run

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[yanzhudd]

/azp run

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[azclibot]

[Release] Update index.json for extension [ aks-preview-19.0.0b13 ] : https://dev.azure.com/msazure/One/_build/results?buildId=142984065&view=results