{AKS} Fix the location logic for managed namespace update

[xmzhao0822]

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az aks namespace update -g charlilirg --cluster-name charliliaks -n ns1 --annotations a=d --subscription c582d154-33c4-47e4-a3c2-0632d20b12eb

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[yonzhan]

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[Copilot]

Pull request overview

This PR adjusts the managed namespace update request construction in aks-preview so that az aks namespace update uses the existing namespace resource’s location, and bumps the extension version/release notes accordingly.

Changes:

• Update managed namespace update logic to set location from the existing namespace.
• Bump aks-preview extension version to 19.0.0b28.
• Add release note entry for the namespace update fix.

Reviewed changes

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

File	Description
src/aks-preview/azext_aks_preview/managednamespace.py	Use existedNamespace.location during managed namespace update instead of looking up cluster location.
src/aks-preview/setup.py	Version bump to 19.0.0b28.
src/aks-preview/HISTORY.rst	Add 19.0.0b28 release notes entry for the change.

[azclibot]

[Release] Update index.json for extension [ aks-preview-19.0.0b28 ] : https://dev.azure.com/msazure/One/_build/results?buildId=158250273&view=results