Report failing jobs when "all required jobs check" fails (#17433)

You can tell this by looking at the JSON input but that's not quite
friendly enough for me.

---------

Co-authored-by: Claude <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -295,4 +295,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: "Check required jobs passed"
-        run: echo '${{ toJSON(needs) }}' | jq -e 'all(.[]; .result == "success" or .result == "skipped")' > /dev/null
+        run: |
+          failing=$(echo "$NEEDS_JSON" | jq -r 'to_entries[] | select(.value.result != "success" and .value.result != "skipped") | "\(.key): \(.value.result)"')
+          if [ -n "$failing" ]; then
+            echo "$failing"
+            exit 1
+          fi
+        env:
+          NEEDS_JSON: ${{ toJSON(needs) }}