Region fix went missing on amazon-eks-node-1.29-v20240202

[marquesj2-ppb]

What happened:

Can't join the node when using the latest AMI update, the #1626 fix is not present on latest image.

How to reproduce it (as minimally and precisely as possible):
Created an EC2 instance using amazon-eks-node-1.29-v20240202 ami-047f9786aebf774c8

[ec2-user@ip-10-xxx-xxx-xxx ~]$ cat /etc/eks/containerd/pull-sandbox-image.sh
#!/usr/bin/env bash
set -euo pipefail

source <(grep "sandbox_image" /etc/containerd/config.toml | tr -d ' ')

### Short-circuit fetching sandbox image if its already present
if [[ "$(sudo ctr --namespace k8s.io image ls | grep $sandbox_image)" != "" ]]; then
  exit 0
fi

MAX_RETRIES=3

function retry() {
  local rc=0
  for attempt in $(seq 0 $MAX_RETRIES); do
    rc=0
    [[ $attempt -gt 0 ]] && echo "Attempt $attempt of $MAX_RETRIES" 1>&2
    "$@"
    rc=$?
    [[ $rc -eq 0 ]] && break
    [[ $attempt -eq $MAX_RETRIES ]] && exit $rc
    local jitter=$((1 + RANDOM % 10))
    local sleep_sec="$(($((5 << $((1 + $attempt)))) + $jitter))"
    sleep $sleep_sec
  done
}

ecr_password=$(retry aws ecr get-login-password)
if [[ -z ${ecr_password} ]]; then
  echo >&2 "Unable to retrieve the ECR password."
  exit 1
fi
retry sudo crictl pull --creds "AWS:${ecr_password}" "${sandbox_image}"

[cartermckinnon]

20240202 isn’t the latest release; this PR was first present in: https://github.com/awslabs/amazon-eks-ami/releases/tag/v20240209