[tests] remove test_sdpa_equivalence (redundant) (#37911)

* rm test_sdpa_equivalence

* make fixup

---------

Co-authored-by: Yih-Dar <2521628+ydshieh@users.noreply.github.com>

tests/models/gemma2/test_modeling_gemma2.py

@@ -143,10 +143,6 @@ class Gemma2ModelTest(GemmaModelTest, unittest.TestCase):
     def test_generate_continue_from_inputs_embeds(self):
         pass
 
-    @unittest.skip("Gemma2's eager attn/sdpa attn outputs are expected to be different")
-    def test_sdpa_equivalence(self):
-        pass
-
     @unittest.skip(
         reason="HybridCache can't be gathered because it is not iterable. Adding a simple iter and dumping `distributed_iterator`"
         " as in Dynamic Cache doesn't work. NOTE: @gante all cache objects would need better compatibility with multi gpu setting"