test: switch to cpu-16-hk runner for diagnostic comparison

Changed runner from linux-amd64-cpu-32-hk to linux-amd64-cpu-16-hk to verify
if cpu-16 runner works properly and compare behavior with cpu-32.

This helps diagnose whether issues are specific to cpu-32 or system-wide.

Author: JavaPythonAIForBAT

.github/workflows/test-cpu-32-runner.yaml

@@ -15,7 +15,7 @@
 # This file is a part of the vllm-ascend project.
 #
 
-name: Test CPU-32 Runner
+name: Test CPU-16 Runner (Diagnostic)
 
 on:
   pull_request:
@@ -32,8 +32,8 @@ defaults:
     shell: bash -el {0}
 
 jobs:
-  test-cpu-32:
-    runs-on: linux-amd64-cpu-32-hk
+  test-cpu-16:
+    runs-on: linux-amd64-cpu-16-hk
     steps:
       - name: Job started - sleeping for debugging
         run: |