Remove lm-format-enforcer reference from test_oracle.py

Signed-off-by: Reza Barazesh <rezabarazesh@meta.com>

Author: rzabarazesh

tests/v1/test_oracle.py

@@ -47,13 +47,6 @@ def test_unsupported_configs(monkeypatch):
                 },
             ).create_engine_config()
 
-        with pytest.raises(NotImplementedError):
-            AsyncEngineArgs(
-                model=MODEL,
-                guided_decoding_backend="lm-format-enforcer",
-                guided_decoding_disable_fallback=True,
-            ).create_engine_config()
-
         with pytest.raises(NotImplementedError):
             AsyncEngineArgs(
                 model=MODEL,