fix qwen3next full graph break. (#3812)

### What this PR does / why we need it?
fix qwen3next full graph break.
linearattention doesnot has aclgraph_support attr，so change to
cudagraph_support to support vllm.
<img width="603" height="120" alt="image"
src="https://github.com/user-attachments/assets/d2de53bb-4147-495a-9129-51d9083749be"
/>

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

### How was this patch tested?


- vLLM version: v0.11.0rc3
- vLLM main:
vllm-project/vllm@releases/v0.11.1

Signed-off-by: wangxiaoxin-sherie <[email protected]>
Co-authored-by: wangxiaoxin-sherie <[email protected]>

Author: momo609

vllm_ascend/worker/model_runner_v1.py

@@ -3775,7 +3775,12 @@ def initialize_aclgraph_capture(self) -> None:
 
         for attn_group in self._attn_group_iterator():
             builder = attn_group.get_metadata_builder()
-            if builder.aclgraph_support.value < min_ag_support.value:
+            graph_support = None
+            if hasattr(builder, 'aclgraph_support'):
+                graph_support = builder.aclgraph_support.value
+            else:
+                graph_support = builder.cudagraph_support.value
+            if graph_support < min_ag_support.value:
                 min_ag_support = builder.aclgraph_support
                 min_ag_builder_name = builder.__class__.__name__