Reconsider implementation of resource_destructor()

I find [the following source code useless](https://github.com/baidu/palo/blob/196967085e8f9b20f47f085c801323bda13fb696/be/src/common/resource_tls.cpp#L33 "Update candidate: resource_destructor()").

```C++
    if (info == nullptr) {
        delete info;
    }
```

:crystal_ball: How should this function implementation evolve further?