feat: new output alb_target_group_names

To be used in conjunction with [AppAutoscaling](https://docs.aws.amazon.com/autoscaling/plans/APIReference/API_PredefinedScalingMetricSpecification.html) with `ALBRequestCountPerTarget`

outputs.tf

@@ -54,8 +54,12 @@ output "task_execution_role_unique_id" {
   value       = try(aws_iam_role.task_execution_role[0].unique_id, "")
 }
 
-// TODO: this output should not start with "aws"
-output "aws_alb_target_group_arns" {
-  description = "ARNs of the created target groups."
+output "alb_target_group_arns" {
+  description = "ARNs of the created target groups as configured by var.target_groups."
   value       = aws_alb_target_group.main[*].arn
 }
+
+output "alb_target_group_names" {
+  description = "names of the created target groups as configured by var.target_groups."
+  value       = aws_alb_target_group.main[*].name
+}