Disable temporarily too slow tests (Longformer/LED) (#10062)

* Disable temporarily too slow tests

* Fix style

* Fix template

tests/test_modeling_tf_longformer.py

@@ -351,10 +351,22 @@ class TFLongformerModelTest(TFModelTesterMixin, unittest.TestCase):
         # Need to check with PVP how to properly fix this
         pass
 
+    @slow
+    def test_saved_model_with_hidden_states_output(self):
+        # Temporarily disable this test in order to find
+        # how to better handle it without timing out the CI
+        pass
+
     def test_saved_model_creation(self):
         # This test is too long (>30sec) and makes fail the CI
         pass
 
+    @slow
+    def test_saved_model_creation_extended(self):
+        # Temporarily disable this test in order to find
+        # how to better handle it without timing out the CI
+        pass
+
     def test_mixed_precision(self):
         # TODO JP: Make Longformer float16 compliant
         pass