[Improvement] add error messages when starting the hugegraph-server fails in the function wait_for_startup of util.sh

### Feature Description (功能描述)

When we fail to curl in the function `wait_for_startup` in the following code (I guess),
```bash
status=$(curl -I -s -k -w "%{http_code}" -o /dev/null "$server_url")
```
there are no error messages of logs

So, we should ensure that we can get the error message instead of waiting for timeout