Add note about enabled ANNOTATE_POD_IP setting to EKS guide.

Author: fasaxc

calico/getting-started/kubernetes/managed-public-cloud/eks.mdx

@@ -38,6 +38,7 @@ When using the Amazon VPC CNI plugin, $[prodname] does not support enforcement o
 ***Prerequisites***
 
 * You [disabled network policy for the AWS VPC CNI](https://docs.aws.amazon.com/eks/latest/userguide/network-policy-disable.html). 
+* You [configured AWS VPC CNI to annotate Pods with their IPs](https://github.com/aws/amazon-vpc-cni-k8s?tab=readme-ov-file#annotate_pod_ip-v193).  Note the requirement to grant the "patch" permission to the `aws-node` daemon set.  Without this setting, pod IPs can propagate slowly when Kubernetes is under load resulting in slow policy application after pod creation.
 
 1. First, create an Amazon EKS cluster.