BREAKING: drop the `Api` from `Resource` types

It's cleaner.
diff --git a/generated/googleapis/test/iamcredentials/v1_test.dart b/generated/googleapis/test/iamcredentials/v1_test.dart
index 4a6a4ec..e75f15b 100644
--- a/generated/googleapis/test/iamcredentials/v1_test.dart
+++ b/generated/googleapis/test/iamcredentials/v1_test.dart
@@ -327,7 +327,7 @@
     });
   });
 
-  unittest.group('resource-ProjectsServiceAccountsResourceApi', () {
+  unittest.group('resource-ProjectsServiceAccountsResource', () {
     unittest.test('method--generateAccessToken', () {
       var mock = HttpServerMock();
       var res = api.IAMCredentialsApi(mock).projects.serviceAccounts;