Enhancement | Consolidate `k8s-eks` layers that must result in a single layer

[exequielrafaela]

Describe the Feature

Consolidate k8s-eks layers that will result in a single layer considering our most updated one is the k8s-eks-demoapps

• Main reference layer: https://github.com/binbashar/le-tf-infra-aws/tree/master/apps-devstg/us-east-1/k8s-eks-demoapps
• 2ry cluster (to be removed / merged in the demoapps one): https://github.com/binbashar/le-tf-infra-aws/tree/master/apps-devstg/us-east-1/k8s-eks
• Old cluster (to be removed): https://github.com/binbashar/le-tf-infra-aws/tree/master/apps-devstg/us-east-1/k8s-eks-v1.17

Why?

Simplify the current k8s-eks reference architecture layers in order to be easier to maintain, update and improve.