Fix raw_request extraction in load_aware_call decorator (#15382)

Signed-off-by: Daniel Salib <danielsalib@meta.com>

vllm/entrypoints/utils.py

@@ -68,13 +68,20 @@ def decrement_server_load(request: Request):
 def load_aware_call(func):
 
     @functools.wraps(func)
-    async def wrapper(*args, raw_request: Request, **kwargs):
+    async def wrapper(*args, **kwargs):
+        raw_request = kwargs.get("raw_request",
+                                 args[1] if len(args) > 1 else None)
+
+        if raw_request is None:
+            raise ValueError(
+                "raw_request required when server load tracking is enabled")
+
         if not raw_request.app.state.enable_server_load_tracking:
-            return await func(*args, raw_request=raw_request, **kwargs)
+            return await func(*args, **kwargs)
 
         raw_request.app.state.server_load_metrics += 1
         try:
-            response = await func(*args, raw_request=raw_request, **kwargs)
+            response = await func(*args, **kwargs)
         except Exception:
             raw_request.app.state.server_load_metrics -= 1
             raise