[DRAFT][Terraform - AKS] For Production environments, enable cluster auto-scaler

[yelghali]

To keep up with application demands in Azure Kubernetes Service (AKS), you may need to adjust the number of nodes that run your workloads. The cluster autoscaler component can watch for pods in your cluster that can't be scheduled because of resource constraints. When issues are detected, the number of nodes in a node pool is increased to meet the application demand. Nodes are also regularly checked for a lack of running pods, with the number of nodes then decreased as needed. This ability to automatically scale up or down the number of nodes in your AKS cluster lets you run an efficient, cost-effective cluster.

c.f https://learn.microsoft.com/en-us/azure/aks/cluster-autoscaler

code scan check
If sku == standard (meant for production clusters):

[enable_auto_scaling=True]
(https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/kubernetes_cluster#enable_auto_scaling)

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