[DB MileageRate] App: Replace workspace mileage rate list with table UI

[rlinoz]

Refactor PolicyDistanceRatePage to use the generic Table component with status, name, rate, start date, and end date columns, plus checkbox selection.

https://docs.google.com/document/d/1ByolNK4XOhNksdl_KDq7TcwJgeXgxDzW384H7SIjMU0/edit?pli=1&tab=t.0#bookmark=id.wr92cps8sj5a

Issue Owner

Current Issue Owner: @thelullabyy

[melvin-bot]

Huh... This is 4 days overdue. Who can take care of this?