Generalize problem_type to all sequence classification models (#14180)

* Generalize problem_type to all classification models

* Missing import

* Deberta BC and fix tests

* Fix template

* Missing imports

* Revert change to reformer test

* Fix style

tests/test_modeling_distilbert.py

@@ -214,7 +214,6 @@ class DistilBertModelTest(ModelTesterMixin, unittest.TestCase):
     test_pruning = True
     test_torchscript = True
     test_resize_embeddings = True
-    test_sequence_classification_problem_types = True
     test_resize_position_embeddings = True
 
     def setUp(self):