[CI] Fix nightly CI (#3821)

### What this PR does / why we need it?
This patch fix the nightly CI runs
[failure](https://github.com/vllm-project/vllm-ascend/actions/runs/18848144365)

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

### How was this patch tested?


- vLLM version: v0.11.0rc3
- vLLM main:
https://github.com/vllm-project/vllm/commit/releases/v0.11.1

---------

Signed-off-by: wangli <wangli858794774@gmail.com>

tests/e2e/nightly/multi_node/scripts/run.sh

@@ -121,7 +121,7 @@ download_go() {
 }
 
 install_ais_bench() {
-    local AIS_BENCH="$SRC_DIR/benchmark"
+    local AIS_BENCH="$SRC_DIR/vllm-ascend/benchmark"
     git clone https://gitee.com/aisbench/benchmark.git $AIS_BENCH
     cd $AIS_BENCH
     git checkout v3.0-20250930-master
@@ -166,8 +166,8 @@ run_tests() {
     kill_npu_processes
     ret=$?
     if [ "$LWS_WORKER_INDEX" -eq 0 ]; then
-        mkdir -p "$(dirname "$RESULT_PATH")"
-        echo $ret > "$RESULT_PATH"
+        mkdir -p "$(dirname "$RESULT_FILE_PATH")"
+        echo $ret > "$RESULT_FILE_PATH"
     fi
     return $ret
 }