Move is_pipeline_test_to_skip to specific model test classes (#21999)

* Move `is_pipeline_test_to_skip` to specific model test classes

---------

Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>

tests/models/ctrl/test_modeling_ctrl.py

@@ -210,6 +210,18 @@ class CTRLModelTest(ModelTesterMixin, GenerationTesterMixin, PipelineTesterMixin
     test_resize_embeddings = False
     test_head_masking = False
 
+    # TODO: Fix the failed tests
+    def is_pipeline_test_to_skip(
+        self, pipeline_test_casse_name, config_class, model_architecture, tokenizer_name, processor_name
+    ):
+        if pipeline_test_casse_name == "ZeroShotClassificationPipelineTests":
+            # Get `tokenizer does not have a padding token` error for both fast/slow tokenizers.
+            # `CTRLConfig` was never used in pipeline tests, either because of a missing checkpoint or because a tiny
+            # config could not be created.
+            return True
+
+        return False
+
     def setUp(self):
         self.model_tester = CTRLModelTester(self)
         self.config_tester = ConfigTester(self, config_class=CTRLConfig, n_embd=37)