Update time selector design.

Screencast: https://screencast.googleplex.com/cast/NjI2Njk2NzIyMzY5NzQwOHw0MDQ3NGM4MS05ZA

Changes to UI design, addition of UTC time difference and copy buttons.

Bug: 330322051
Test: npm run test:unit:ci

Change-Id: I91f95d8db614de230d17be34f422f873a64ed4bd
4 files changed