Add more and details info to corpus in corpus management page - file listing
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### Problem to solve
Show more relevant info to help the user understand the corpus more and decide to choose to add/edit or remove corpus
### Proposal

Design figma:https://www.figma.com/file/eSIeuIPKFwEDs4X9ky2O5E/Corpus-Registry?node-id=661%3A0
- ~~Each corpus can be expanded and `show all files`~~
- Add the following columns to the corpus listing page: `File count`, `Coverage`, and `Crashes`
- Make sure buttons are using [the current button component](https://gitlab-org.gitlab.io/gitlab-ui/?path=/story/base-button--default&args=variant:confirm) (the [previous design](https://gitlab.com/gitlab-org/gitlab/-/issues/268004/designs/Corpus-list-expanded-more-info.png?version=85843) used a depreciated button style)
- Tell the user how many files contained in this corpus to give the user a quick overview
epic