[`azure-aks`] Migrate to `terraform-azurerm-avm-res-containerservice-managedcluster` official AVM module

[alambike]

Motivation

Reading Azure/terraform-azurerm-aks#597 (comment), it seems that the current module we use to manage Azure AKS is not supporting azurerm v4, and the maintainers are recommending a new avm-res-containerservice-managedcluster module, under the AVM initiative.

In any case, the new AVM module seems to be in early stages yet, with only a 0.1.0 initial version published. We need to pause this task until see the evolution of this new module, and the previous terraform-azurerm-aks.

cc/ @gustavoborragan ⬆️

[alambike]

A new release version terraform-azurerm-aks@9.3.0 with support for azurerm v4 has been released: Azure/terraform-azurerm-aks#597 (comment)

https://github.com/Azure/terraform-azurerm-aks/blob/main/CHANGELOG.md#930-2024-12-11

Take into account that, in addition to the update, it is necessary to point to a module subfolder,
setting module's source to Azure/aks/azurerm//v4

[alambike]

Time has come:
Azure/terraform-azurerm-aks#723 (comment)

New module to migrate to:
https://github.com/Azure/terraform-azurerm-avm-res-containerservice-managedcluster