Support AKS Managed Cluster with AAD integration and kubernetes RBAC

[aleexx17]

/kind feature

If you set up an AKS cluster that is AAD managed, the RBAC setting is currently automatically set to Azure RBAC.
Normally, if you use the Azure CLI, for example, if you only set AAD Managed to true, an AAD cluster with Kubernetes Managed RBAC is created.

In order to utilise the full functionality, it would be useful to define "EnableAzureRBAC" as a separate value field which can be set to true or false.
It would make sense to set the default value of EnbaleAzureRBAC to false so that you have the same functionality as with the other providers.

e.g.

  aadProfile:
    managed: true
    enableAzureRBAC: false
    adminGroupObjectIDs: ["someID"]

creates an AAD Managed Cluster with Kubernetes RBAC.

  aadProfile:
    managed: true
    enableAzureRBAC: true
    adminGroupObjectIDs: ["someID"]

creates an AAD Managed Cluster with Azure RBAC

See official MS documentation:

https://learn.microsoft.com/en-us/azure/aks/managed-azure-ad
https://learn.microsoft.com/en-us/azure/aks/azure-ad-rbac?tabs=portal
https://learn.microsoft.com/en-us/azure/aks/manage-azure-rbac

See implementation from other providers:

https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/kubernetes_cluster#azure_rbac_enabled

[mboersma]

This should be possible now via the ASOAPI. Let's provide an example in documentation.