Pre-req for AKS 1.27 - Istio and helm upgrade

• Upgrade istio to 1.19.5 as 1.15.x it is no longer supported in AKS 1.27

• Upgrade helm tools to 3.13.x as 3.9.x it is no longer supported in AKS 1.27

• Updated deprecated kube api versions

• Related to infra-azure-provisioning!917 (merged)

• Related to infra-azure-provisioning#325 (closed)

BE AWARE THAT AKS 1.25 HAS REACHED EOL (Jan-14, 2024) And Istio 1.15 it is no longer compatible with K8s 1.27

https://learn.microsoft.com/en-us/azure/aks/supported-kubernetes-versions?tabs=azure-cli#aks-kubernetes-release-calendar