Support EKS Pod Identity

[RamazanKara]

Summary

EKS released in Nov/2023 EKS Pod Identity, this is an alternative to IAM roles for service accounts (IRSA)

Motivation

Have additional options on how Argo Rollouts authenticates with AWS for ALB communication other than using IRSA.

Proposal

To support EKS Pod Identity the change is transparent if your using the aws-sdk, the version of the sdk needs to be updated to a recent version that supports EKS Pod Identity.

[zachaller]

We are already running the latest aws sdk pretty sure so not sure there is anything to do.