Use SSM to pull AMI ID dynamically in launch template, instead of par…

…ameter fetched on TF apply

terraform/environments/performance-hub/module/ecs/main.tf

@@ -26,10 +26,6 @@ data "aws_lb_target_group" "target_group" {
   }
 }
 
-data "aws_ssm_parameter" "ecs_optimized_ami" {
-  name = "/aws/service/ami-windows-latest/Windows_Server-2019-English-Full-ECS_Optimized"
-}
-
 resource "aws_autoscaling_group" "cluster-scaling-group" {
   vpc_zone_identifier = sort(data.aws_subnets.shared-private.ids)
   desired_capacity    = var.ec2_desired_capacity
@@ -99,7 +95,7 @@ resource "aws_security_group" "cluster_ec2" {
 }
 
 # EC2 launch template - settings to use for new EC2s added to the group
-# Note - when updating this you will need to manually terminate the EC2s
+# Note - to force a new AMI you will need to manually terminate the EC2s
 # so that the autoscaling group creates new ones using the new launch template
 
 resource "aws_launch_template" "ec2-launch-template" {