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>

vllm_ascend/platform.py

@@ -551,7 +551,7 @@ class NPUPlatform(Platform):
         attn_metadata: dict[str, Any],
         vllm_config: VllmConfig,
         dp_metadata,
-        virtual_engine: int = 0,
+        virtual_engine: int = 0,  # ToDo:: Remove me when upgrade to vllm 0.19.0 from 0.18.0
         num_tokens: int = 0,
         num_tokens_across_dp: torch.Tensor | None = None,
         cudagraph_runtime_mode=None,