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/reformer/test_modeling_reformer.py

@@ -709,6 +709,22 @@ class ReformerLSHAttnModelTest(
     test_headmasking = False
     test_torchscript = 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 == "QAPipelineTests"
+            and tokenizer_name is not None
+            and not tokenizer_name.endswith("Fast")
+        ):
+            # `QAPipelineTests` fails for a few models when the slower tokenizer are used.
+            # (The slower tokenizers were never used for pipeline tests before the pipeline testing rework)
+            # TODO: check (and possibly fix) the `QAPipelineTests` with slower tokenizer
+            return True
+
+        return False
+
     def setUp(self):
         self.model_tester = ReformerModelTester(
             self,