Feat: Hope to make multiple selections on the test case management page of the collection

[Ellery1]

比如我想删除多个用例，现在只能一个个点击删除，前端界面反应又很慢...非常花时间

For example, I want to delete multiple test cases, and now I can only click to delete them one by one, and the front-end interface is slow to respond... It's very time-consuming.

[lijing-22]

Thanks for suggestion, we will allows users to select multiple items here in the future.