Support for new regions: ECR repo

[rajkz]

Describe the bug
When we deploy [AWS Amazon EKS add-ons] to the cluster, Terragrunt modules are not able to pull & push images from Amazon ECR private registry in newer regions. This is because the newer regions are not added to the supported list in https://github.com/gruntwork-io/kubergrunt/blob/main/eks/sync.go

To Reproduce
Terragrunt version: v0.36.10
Kubergrunt version: v0.9.3

Steps to reproduce :
Try to install an add on eks cluster in region: ap-southeast-3

resource "aws_eks_addon" "vpc-cni" {
  cluster_name = var.cluster_name
  addon_name   = "vpc-cni"
  addon_version  = var.vpc_cni_addon_version
  resolve_conflicts = "OVERWRITE"
}

Expected behavior
The Add Ons should be installed without any issues. Terragrunt should pick the correct ECR repo id for new regions

[rajkz]

Will be resolved in #192