Fixed e2e tests for alloydb module (#2321)

* fixed e2e tests for alloydb module

tests/fixtures/alloydb-kms-iam-grant.tf

@@ -0,0 +1,21 @@
+/**
+ * Copyright 2024 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+resource "google_kms_crypto_key_iam_member" "alloydb_encrypt_decrypt" {
+  crypto_key_id = var.kms_key.id
+  role          = "roles/cloudkms.cryptoKeyEncrypterDecrypter"
+  member        = "serviceAccount:service-${var.project_number}@gcp-sa-alloydb.iam.gserviceaccount.com"
+}