Implement move time range controls for search bar in dashboard widget edit mode.

## Description

https://github.com/Graylog2/graylog2-server/pull/22953 adds move range buttons for the time range display on the search and dashboards page.

It makes sense to also implement these controls for the dashboard widget edit mode. The challenge here is that the related time range object has a slightly different time format, which ideally gets refactored first.