Frontend: Update scanners table rows
* [x] Create a new FF (https://gitlab.com/gitlab-org/gitlab/-/work_items/594052)
* [x] Update the existing table to match the new design:
1. Scanner health (Status):
* Display more statuses.
* Display precise scan count detail.
2. Last scan:
* Display precise scan timing details.
* [x] Using mock data (since the GraphQL is not yet implement https://gitlab.com/gitlab-org/gitlab/-/work_items/593133)
* [x] Add unit test
task