[2/N] Elastic EP Milestone 2: Integrating NIXL-EP (#35627)

Signed-off-by: Itay Alroy <ialroy@nvidia.com>
Co-authored-by: Yongji Wu <wuyongji317@gmail.com>
Co-authored-by: Ron Tourgeman <rtourgeman@nvidia.com>

tests/v1/engine/test_engine_core_client.py

@@ -150,6 +150,7 @@ def test_mp_client_uses_env_timeout(monkeypatch: pytest.MonkeyPatch):
         data_parallel_hybrid_lb=False,
         data_parallel_external_lb=False,
         local_engines_only=False,
+        enable_elastic_ep=False,
     )
     vllm_config = SimpleNamespace(parallel_config=parallel_config)