remove features in devcontainer

[hnwyllmm]

What problem were solved in this pull request?

Problem: oceanbase/miniob 镜像中已经把需要的依赖都加上了，如果还需要其它依赖，应该调整miniob镜像。 而且在国内安装devcontainer features中描述的组件，特别慢。

What is changed and how it works?

删除devcontainer文件中features相关内容

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 36.99%. Comparing base (c9e9bb7) to head (264d4ae).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #348 +/- ## ======================================= Coverage 36.99% 36.99% ======================================= Files 101 101 Lines 7272 7272 ======================================= Hits 2690 2690 Misses 4582 4582 ```

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