[Misc] Add warning for incompatible Ray backend with ACL Graph mode (#2132)

### What this PR does / why we need it?

cherry-pick #1501 from 0.9.1-dev to main

Currently, Ray is not compatible with ACL Graph, so we need to fall back
to eager mode when using the Ray backend.

co-authored: Yizhou Liu <liu_yizhou@outlook.com>

- vLLM version: v0.10.0
- vLLM main:
2836dd73f1

Signed-off-by: 22dimensions <waitingwind@foxmail.com>

vllm_ascend/platform.py

@@ -153,6 +153,11 @@ class NPUPlatform(Platform):
                 "Torchair compilation enabled on NPU. Setting level to NO_COMPILATION"
             )
             compilation_config.level = CompilationLevel.NO_COMPILATION
+        elif parallel_config.distributed_executor_backend == "ray":
+            logger.warning(
+                "Ray distributed executor backend is not compatible with ACL Graph mode "
+                "right now. Setting level to NO_COMPILATION")
+            compilation_config.level = CompilationLevel.NO_COMPILATION
         else:
             logger.info(
                 "PIECEWISE compilation enabled on NPU. use_inductor not supported - "