az aks adds Container Insights onboarding and offboarding flags
When enabling Container Insights on a new or existing managed-identity AKS cluster, use `az aks create` or `az aks update` with `--enable-azure-monitor-logs`; to turn it off, use `az aks update` with `--disable-azure-monitor-logs`. Replace deprecated `--enable-msi-auth-for-monitoring` with `--enable-azure-monitor-logs` where applicable.
az aks create --resource-group <resource-group> --name <cluster-name> --enable-azure-monitor-logs