Fix AOTI runner

Author: larryliu0820

.github/workflows/pull.yml

@@ -927,6 +927,11 @@ jobs:
         run: |
           echo "Intalling pip3 packages"
           ./install/install_requirements.sh
+
+          # Install ET
+          source ./torchchat/utils/scripts/install_utils.sh
+          install_executorch_python_libs
+
           pip3 list
           python3 -c 'import torch;print(f"torch: {torch.__version__, torch.version.git_version}")'
       - name: Set ET git sha