[EKS] [request]: Support building automated EKS AMIs with EC2 Image Builder

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**Tell us about your request**
I'd like to be able build EKS AMIs based on the EKS optimised AMI or Bottlerocket using the SSM parameters describing the latest version available. There is already aws/ec2-image-builder-roadmap#67 opened for this but it doesn't look like it's been prioritised.

**Which service(s) is this request for?**
EKS

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**
I need to create an AMI based on the EKS optimised AMI with FIPS enabled whenever the base AMI is updated.

**Are you currently working around this issue?**
Manually changing the configuration.

**Additional context**
n/a

**Attachments**
n/a

Start by reviewing aws/ec2-image-builder-roadmap#67 and the EKS optimized AMI and Bottlerocket SSM-parameter requirements described in the issue. Define the automation scope for rebuilding FIPS-enabled AMIs when the base AMI changes; the issue names no repository files or tests, so implementation entry points and completion checks still need maintainer guidance.

Written by the indexing model from the issue text.