Generally Available: Cluster Extension Manager move to AKS control plane

Extension Manager, the core component responsible for managing the lifecycle of AKS cluster extensions, has been moved from customer worker nodes to the AKS control plane. This transition enhances security, simplifies networking, and reduces operational overhead - delivering a more robust and streamlined experience for managing extensions like Azure Backup, Azure Container Storage, Flux (GitOps)  as well as third-party solutions such as Cast AI and Cilium.

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