make tests for notifications provider agnostic

Signed-off-by: Somtochi Onyekwere <somtochionyekwere@gmail.com>

tests/integration/terraform/gcp/pubsub.tf

@@ -0,0 +1,11 @@
+resource "google_pubsub_topic" "pubsub" {
+  name                       = local.name
+  labels                     = var.tags
+  message_retention_duration = "7200s"
+}
+
+resource "google_pubsub_subscription" "sub" {
+  project = var.gcp_project_id
+  name    = local.name
+  topic   = google_pubsub_topic.pubsub.name
+}