Fix Azure Terraform installation. (#1793)

Helm chart for Feast in the Terraform installation changed to
point to the location referenced in the Azure Helm installation
documentation (https://docs.feast.dev/feast-on-kubernetes-1/getting-started/install-feast/kubernetes-azure-aks-with-helm)

Fixes issue 1792

Signed-off-by: Matthew Murdoch <matthew.murdoch.0@gmail.com>

infra/terraform/azure/helm.tf

@@ -82,7 +82,8 @@ resource "helm_release" "feast" {
 
   name  = var.name_prefix
   namespace = var.aks_namespace
-  chart = "../../charts/feast"
+  repository = "https://feast-helm-charts.storage.googleapis.com"
+  chart = "feast"
 
   values = [
     yamlencode(local.feast_helm_values)