[Terraform-AWS] Replace CLB with NLB (#8578)

contrib/terraform/aws/create-infrastructure.tf

contrib/terraform/aws/modules/elb/main.tf

contrib/terraform/aws/modules/elb/outputs.tf

contrib/terraform/aws/modules/nlb/main.tf

contrib/terraform/aws/modules/nlb/outputs.tf

contrib/terraform/aws/modules/nlb/variables.tf

contrib/terraform/aws/output.tf

contrib/terraform/aws/sample-inventory/cluster.tfvars

contrib/terraform/aws/templates/inventory.tpl

contrib/terraform/aws/terraform.tfvars

contrib/terraform/aws/terraform.tfvars.example

contrib/terraform/aws/variables.tf