Skip hanging collective test (#18908)

(cherry picked from commit 7a5b7f5)

Author: awaelchli

tests/tests_fabric/plugins/collectives/test_torch_collective.py

@@ -230,6 +230,7 @@ def _test_distributed_collectives_fn(strategy, collective):
     torch.testing.assert_close(out, expected)
 
 
+@pytest.mark.skip(reason="test hangs too often")
 @skip_distributed_unavailable
 @pytest.mark.parametrize(
     "n", [1, pytest.param(2, marks=[RunIf(skip_windows=True), pytest.mark.xfail(raises=TimeoutError, strict=False)])]