Mark pipeline tests to skip them easily (#21887)

* Mark pipeline tests to skip them easily

* Mark the mixin as pipeline test

* Update src/transformers/testing_utils.py

Co-authored-by: Yih-Dar <2521628+ydshieh@users.noreply.github.com>

---------

Co-authored-by: Yih-Dar <2521628+ydshieh@users.noreply.github.com>

tests/pipelines/test_pipelines_visual_question_answering.py

@@ -16,7 +16,14 @@ import unittest
 
 from transformers import MODEL_FOR_VISUAL_QUESTION_ANSWERING_MAPPING, is_vision_available
 from transformers.pipelines import pipeline
-from transformers.testing_utils import nested_simplify, require_tf, require_torch, require_vision, slow
+from transformers.testing_utils import (
+    is_pipeline_test,
+    nested_simplify,
+    require_tf,
+    require_torch,
+    require_vision,
+    slow,
+)
 
 from .test_pipelines_common import ANY
 
@@ -31,6 +38,7 @@ else:
             pass
 
 
+@is_pipeline_test
 @require_torch
 @require_vision
 class VisualQuestionAnsweringPipelineTests(unittest.TestCase):