fix: propagate errors from parallel downloads in res-update-game workflow (#14794)

* Initial plan

* fix: properly handle errors in parallel downloads for stages.json

Co-authored-by: AnnAngela <9762652+AnnAngela@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: AnnAngela <9762652+AnnAngela@users.noreply.github.com>

.github/workflows/res-update-game.yml

@@ -107,6 +107,7 @@ jobs:
 
           parameters=("CN" "US" "JP" "KR")
 
+          pids=()
           for param in "${parameters[@]}"; do
             {
               if curl -f -s -o "stages_${param}.json" "${baseUrl}${param}"; then
@@ -116,8 +117,20 @@ jobs:
                 exit 1
               fi
             } &
+            pids+=($!)
           done
-          wait
+
+          failed=0
+          for pid in "${pids[@]}"; do
+            if ! wait "$pid"; then
+              failed=1
+            fi
+          done
+
+          if [ $failed -ne 0 ]; then
+            echo "One or more downloads failed" >&2
+            exit 1
+          fi
 
       - name: Upload Taiwan resources
         uses: actions/upload-artifact@v5