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