Add blog post for EKS Auto Mode (#13529)

> Today at re:Invent, AWS announced Amazon Elastic Kubernetes Service (Amazon EKS) Auto Mode, a new feature that fully automates compute, storage, and networking management for Kubernetes clusters.

[AWS Announcement](https://aws.amazon.com/about-aws/whats-new/2024/12/amazon-eks-auto-mode/)
[AWS Blog post](https://aws.amazon.com/blogs/aws/streamline-kubernetes-cluster-management-with-new-amazon-eks-auto-mode/)

This adds a blog post about the new EKS Auto Mode feature AWS released and how users can leverage it with Pulumi.
This is the PR for adding support to pulumi-eks: pulumi/pulumi-eks#1519