feat: Add user data of agent to outputs (#618)

Author: kayman-mk

outputs.tf

@@ -51,4 +51,9 @@ output "runner_eip" {
 output "runner_launch_template_name" {
   description = "The name of the runner's launch template."
   value       = aws_launch_template.gitlab_runner_instance.name
+}
+
+output "runner_user_data" {
+  description = "The user data of the Gitlab Runner Agent's launch template."
+  value       = local.template_user_data
 }