Main2main upgrade vllm commit to 03 19 17:00 (#7478)

### What this PR does / why we need it?
Upgrade vllm commit to 2026.03.19.

1.Fix socket removed from StatelessProcessGroup. Upstream vLLM PR
[#36330](https://github.com/vllm-project/vllm/pull/36330) ("elastic_ep:
Fix stateless group port races") refactored StatelessProcessGroup and
removed the socket: socket.socket | None field. The socket ownership was
moved to a new create_tcp_store() helper instead of being stored as a
field on the dataclass.

2.fix `virtual_engine` parameter removed from `set_forward_context().
Upstream [V0 Deprecation] Deprecate virtual engine
[#37195](https://github.com/vllm-project/vllm/pull/37195)

### Does this PR introduce _any_ user-facing change?
NA

### How was this patch tested?
NA

- vLLM version: v0.17.0
- vLLM main:
8b6325758c

---------

Signed-off-by: leo-pony <nengjunma@outlook.com>

tests/ut/distributed/device_communicators/test_pyhccl.py

@@ -6,6 +6,7 @@ from vllm.distributed.utils import StatelessProcessGroup
 from tests.ut.base import TestBase
 from vllm_ascend.distributed.device_communicators.pyhccl import \
     PyHcclCommunicator
+from vllm_ascend.utils import ACL_FORMAT_FRACTAL_NZ, vllm_version_is
 
 
 class MockHcclLib:
@@ -45,10 +46,15 @@ class TestPyHcclCommunicator(TestBase):
     @patch("vllm_ascend.utils.current_stream",
            return_value=MagicMock(npu_stream=5678))
     def test_stateless_group(self, *_):
-        group = StatelessProcessGroup(rank=3,
-                                      world_size=4,
-                                      store=None,
-                                      socket=None)
+        if vllm_version_is("0.18.0"):
+            group = StatelessProcessGroup(rank=3,
+                                        world_size=4,
+                                        store=None,
+                                        socket=None)
+        else:
+            group = StatelessProcessGroup(rank=3,
+                                        world_size=4,
+                                        store=None)
 
         comm = PyHcclCommunicator(group=group, device=3)