fix(core_project_factory): ignore if SA already exists (#910)

Author: apeabody

modules/core_project_factory/main.tf

@@ -143,10 +143,11 @@ resource "google_project_default_service_accounts" "default_service_accounts" {
   Default Service Account configuration
  *****************************************/
 resource "google_service_account" "default_service_account" {
-  count        = var.create_project_sa ? 1 : 0
-  account_id   = var.project_sa_name
-  display_name = "${var.name} Project Service Account"
-  project      = google_project.main.project_id
+  count                        = var.create_project_sa ? 1 : 0
+  account_id                   = var.project_sa_name
+  display_name                 = "${var.name} Project Service Account"
+  project                      = google_project.main.project_id
+  create_ignore_already_exists = true
 }
 
 /**************************************************