test(e2e): Add docker-based infra scenario for Admin UI tests (#4166)

* chore(e2e): Add docker-based scenario for Admin UI tests

* test(e2e): Trim space in worker_led_token output

enos/modules/docker_worker/main.tf

@@ -155,5 +155,5 @@ output "upstream_address" {
 }
 
 output "worker_led_token" {
-  value = var.worker_led_registration ? enos_local_exec.get_worker_led_token[0].stdout : ""
+  value = var.worker_led_registration ? trimspace(enos_local_exec.get_worker_led_token[0].stdout) : ""
 }