[Refactor][CI] Reorganize test tree, and move slow e2e to weekly (#4951)

Signed-off-by: wangyu <410167048@qq.com>

tests/e2e/features/fullduplex/engine/test_duplex_intermediate.py

@@ -0,0 +1,14 @@
+import pytest
+
+from vllm_omni.experimental.fullduplex.engine.intermediate import get_stream_request_key
+
+pytestmark = [pytest.mark.core_model, pytest.mark.cpu]
+
+
+def test_get_stream_request_key_requires_stable_identifier():
+    with pytest.raises(ValueError, match="stable request id"):
+        get_stream_request_key({"ids": {"tts": [1, 2, 3]}})
+
+
+def test_get_stream_request_key_accepts_global_request_id():
+    assert get_stream_request_key({"global_request_id": ["duplex-sid-stage0"]}) == "duplex-sid-stage0"