chore: remove pubsub module

terraform/faas.tf

-module "pubsub" {
-  source     = "./modules/pubsub"
-  topic_name = "faas-test"
+resource "google_pubsub_topic" "faas_test" {
+  name    = "faas-test"
+  project = local.project
 }
 
 module "faas_service" {
@@ -14,7 +14,7 @@ module "faas_service" {
   timeout_seconds = 10
 
   triggers = {
-    pubsub_topic_id = module.pubsub.main_topic_id
+    pubsub_topic_id = google_pubsub_topic.faas_test.id
   }
 
   function_env = [
@@ -41,7 +41,7 @@ module "faas_service_set_retry" {
   timeout_seconds = 20
 
   triggers = {
-    pubsub_topic_id = module.pubsub.main_topic_id
+    pubsub_topic_id = google_pubsub_topic.faas_test.id
   }
 
   retry_count = 4

terraform/modules/pubsub/main.tf

-resource "google_pubsub_topic" "main" {
-  name = var.topic_name
-}

terraform/modules/pubsub/outputs.tf

-output "main_topic_id" {
-  value       = google_pubsub_topic.main.id
-  description = "The ID of the main Pub/Sub topic."
-}

terraform/modules/pubsub/variables.tf

-variable "topic_name" {
-  type        = string
-  description = "The name of the Pub/Sub topic."
-}