Disable test_zch_hash_disable_fallback in oss because of flakiness (#3426)

Summary:
Pull Request resolved: #3426

Disable test_zch_hash_disable_fallback in oss because of flakiness

Reviewed By: aliafzal, spmex

Differential Revision: D83788664

fbshipit-source-id: f91f315f23bba0b13de8446e520f3371890089a4

Author: nipung90

torchrec/modules/tests/test_hash_mc_modules.py

@@ -689,12 +689,13 @@ def test_dynamically_switch_inference_training_mode(self) -> None:
         self.assertTrue(m._eviction_policy_name is None)
         self.assertTrue(m._eviction_module is None)
 
+    # Skipping this test because it is flaky on CI. TODO: T240185573 T240185565 investigate the flakiness and re-enable the test.
     # Pyre-ignore [56]: Pyre was not able to infer the type of argument `torch.cuda.device_count() < 1` to decorator factory `unittest.skipIf`
     @unittest.skipIf(
         torch.cuda.device_count() < 1,
         "Not enough GPUs, this test requires at least two GPUs",
     )
-    def test_zch_hash_disable_fallback(self) -> None:
+    def test_zch_hash_disable_fallback_disabled_in_oss_compatatibility(self) -> None:
         m = HashZchManagedCollisionModule(
             zch_size=30,
             device=torch.device("cuda"),