[feature][docs] 禁止code-server docker在第一次debug C++文件前先花费数十分钟下载一个15.5M的debug info文件 + launch.json/tasks.json小调优

最近部署code server(vscode docker)，容器重启后第一次debug cpp时会：

```
Stopped due to shared library event (no libraries added or removed)
Loaded '/lib64/ld-linux-x86-64.so.2'. Symbols loaded.
Downloading 15.52 M separate debug info for /lib64/libstdc++.so.6...
```

用户体验很不好