Temporarily adjust the scheulde for pr-test.yml to 12 hours (#20951)

.github/workflows/pr-test.yml

@@ -5,7 +5,7 @@ run-name: ${{ inputs.target_stage && (inputs.pr_head_sha && format('[{0}] {1}',
 
 on:
   schedule:
-    - cron: '0 */6 * * *'  # Run every 6 hours
+    - cron: '0 */12 * * *'  # Run every 12 hours
   pull_request:
     branches: [main]
   workflow_dispatch: