Enable Karpenter resources and add cleanup script

Uncommented and activated Karpenter-related Terraform resources and variables for EKS integration, updated S3 backend key for state storage, and added a script to clean up Terraform state files from S3. This improves infrastructure automation and provides a utility for state management.

Author: arunlalp

infra/eks-karpenter/backend.tf

@@ -1,7 +1,7 @@
 terraform {
   backend "s3" {
     bucket = "techies-terraform"
-    key = "dev/eks/eks.tfstate"
+    key = "dev/eks-karpenter/eks.tfstate"
     region = "us-east-1"
     use_lockfile = true
   }