chore: remove redundant test-complete job from test workflow (#21106)

The test-complete aggregate job adds no value as GitHub Actions
already provides visibility into matrix job results.

Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

.github/workflows/test-litellm-matrix.yml

@@ -93,17 +93,3 @@ jobs:
             --maxfail=10 \
             -n ${{ matrix.test-group.workers }} \
             --durations=20
-
-  # Aggregate job to require all matrix jobs pass
-  test-complete:
-    needs: test
-    runs-on: ubuntu-latest
-    if: always()
-    steps:
-      - name: Check test results
-        run: |
-          if [ "${{ needs.test.result }}" != "success" ]; then
-            echo "Some test groups failed"
-            exit 1
-          fi
-          echo "All test groups passed!"