[CI] Add multi-node test case for a2 (#3805)

### What this PR does / why we need it?
This patch add multi-node test case for a2
### Does this PR introduce _any_ user-facing change?

### How was this patch tested?

- vLLM version: v0.11.0rc3
- vLLM main:
c9461e05a4

---------

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

tests/e2e/nightly/multi_node/scripts/lws.yaml.jinja2

@@ -37,11 +37,11 @@ spec:
                 bash /root/.cache/tests/run.sh
             resources:
               limits:
-                huawei.com/ascend-1980: "16"
+                huawei.com/ascend-1980: {{ npu_per_node | default("16") }}
                 memory: 512Gi
                 ephemeral-storage: 100Gi
               requests:
-                huawei.com/ascend-1980: "16"
+                huawei.com/ascend-1980: {{ npu_per_node | default("16") }}
                 ephemeral-storage: 100Gi
                 cpu: 125
             ports:
@@ -95,11 +95,11 @@ spec:
                 bash /root/.cache/tests/run.sh
             resources:
               limits:
-                huawei.com/ascend-1980: "16"
+                huawei.com/ascend-1980: {{ npu_per_node | default("16") }}
                 memory: 512Gi
                 ephemeral-storage: 100Gi
               requests:
-                huawei.com/ascend-1980: "16"
+                huawei.com/ascend-1980: {{ npu_per_node | default("16") }}
                 ephemeral-storage: 100Gi
                 cpu: 125
             volumeMounts: