Reduce the time spent for the TF slow tests (#10152)

* rework savedmodel slow test

* Improve savedmodel tests

* Remove useless content

tests/test_modeling_tf_led.py

@@ -370,27 +370,10 @@ class TFLEDModelTest(TFModelTesterMixin, unittest.TestCase):
         # TODO JP: Make LED XLA compliant
         pass
 
-    def test_saved_model_with_attentions_output(self):
-        # Temporarily disable this test in order to find
-        # how to better handle it without timing out the CI
-        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 _assert_tensors_equal(a, b, atol=1e-12, prefix=""):
     """If tensors not close, or a and b arent both tensors, raise a nice Assertion error."""