fix: Update the format of "id" output in the "simple-sa" module

Make the output "id" returning just a service account ID instead of
the map with ID and an e-mail.
There is already a separate output for the e-mail, called "email".

modules/simple-sa/outputs.tf

@@ -25,11 +25,8 @@ output "iam_email" {
 }
 
 output "id" {
-  description = "Service account id and email"
-  value = {
-    id    = google_service_account.sa.account_id,
-    email = google_service_account.sa.email
-  }
+  description = "Service account id in the format 'projects/{{project}}/serviceAccounts/{{email}}'"
+  value       = google_service_account.sa.account_id
 }
 
 output "env_vars" {