platform/aws: Use autogenerated target group names

ELB target group names are limited to 32 characters. Since we easily
hit this limit when trying to include the cluster and pool name in
the target group name, we move this information to AWS tags and let
Terraform generate a target group name automatically.

assets/lokomotive-kubernetes/aws/flatcar-linux/kubernetes/nlb.tf

@@ -38,7 +38,6 @@ resource "aws_lb_listener" "apiserver-https" {
 
 # Target group of controllers
 resource "aws_lb_target_group" "controllers" {
-  name        = "${var.cluster_name}-controllers"
   vpc_id      = aws_vpc.network.id
   target_type = "instance"
 
@@ -57,6 +56,10 @@ resource "aws_lb_target_group" "controllers" {
     # Interval between health checks required to be 10 or 30
     interval = 10
   }
+
+  tags = {
+    ClusterName = var.cluster_name
+  }
 }
 
 # Attach controller instances to apiserver NLB

assets/lokomotive-kubernetes/aws/flatcar-linux/kubernetes/workers/ingress.tf

@@ -21,7 +21,6 @@ resource "aws_lb_listener" "ingress-https" {
 }
 
 resource "aws_lb_target_group" "workers-http" {
-  name        = "${var.cluster_name}-${var.pool_name}-http"
   vpc_id      = var.vpc_id
   target_type = "instance"
 
@@ -41,10 +40,14 @@ resource "aws_lb_target_group" "workers-http" {
     # Interval between health checks required to be 10 or 30
     interval = 10
   }
+
+  tags = {
+    ClusterName = var.cluster_name
+    PoolName    = var.pool_name
+  }
 }
 
 resource "aws_lb_target_group" "workers-https" {
-  name        = "${var.cluster_name}-${var.pool_name}-https"
   vpc_id      = var.vpc_id
   target_type = "instance"
 
@@ -64,4 +67,9 @@ resource "aws_lb_target_group" "workers-https" {
     # Interval between health checks required to be 10 or 30
     interval = 10
   }
+
+  tags = {
+    ClusterName = var.cluster_name
+    PoolName    = var.pool_name
+  }
 }