fix: remove ownership and permission settings from MCP configuration script for v3

Author: YuchengMaUTK

template/v3/dirs/etc/sagemaker-ui/sagemaker_ui_post_startup.sh

@@ -269,9 +269,6 @@ if [ -f "$source_file" ]; then
         echo "Created new MCP configuration with default servers"
     fi
 
-    # Set proper ownership and permissions
-    chown $NB_USER:$NB_GID "$target_file"
-    chmod 644 "$target_file"
     echo "Successfully configured MCP for SageMaker"
 else
     echo "Warning: MCP configuration file not found at $source_file"