fix: limit asset types to avoid exceeding quota

Author: busunkim96

asset/snippets/snippets/quickstart_listassets_test.py

@@ -22,6 +22,6 @@
 
 
 def test_list_assets(capsys):
-    quickstart_listassets.list_assets(project_id=PROJECT, asset_types=[], page_size=10)
+    quickstart_listassets.list_assets(project_id=PROJECT, asset_types=["iam.googleapis.com/Role"], page_size=10)
     out, _ = capsys.readouterr()
     assert 'asset' in out