[Asset] Test: fix bucket clean up logic. [(#1845)](#1845)

Author: peter-zheng-g

asset/snippets/snippets/quickstart_exportassets_test.py

@@ -33,16 +33,16 @@ def storage_client():
 
 @pytest.fixture(scope='module')
 def asset_bucket(storage_client):
-    storage_client.create_bucket(BUCKET)
+    bucket = storage_client.create_bucket(BUCKET)
+
+    yield BUCKET
 
     try:
-        storage_client.delete_bucket(BUCKET)
+        bucket.delete(force=True)
     except Exception as e:
         print('Failed to delete bucket{}'.format(BUCKET))
         raise e
 
-    yield BUCKET
-
 
 def test_export_assets(asset_bucket, capsys):
     dump_file_path = 'gs://{}/assets-dump.txt'.format(asset_bucket)