[Feature]: enhance snb cases workflow and project operator for basic tests

[qishipengqsp]

1. Optimize the test workflow of snb with insta framework, including loading sample data, tuning the query and set database config
2. enhance the project operator implementation to support return.

[r2cn-bot]

任务创建成功。

[Kyrie112]

/request-assign

[r2cn-bot]

认领成功：等待导师审核，请及时联系导师进行审核。

[qishipengqsp]

/intern-approve

[r2cn-bot]

认领审核成功：已将该任务分配给学生。