**PLEASE NOTE THAT THIS DIFF AND SUBSEQUENT DIFFS IN THIS STACK WILL NOT BE LANDED UNTIL MORE OF THE REDESIGN IS READY SINCE THIS WILL CAUSE REGRESSIONS IN PROD**
This diff updates the calendar ui to match the ui in the new web app redesign. For reference, here is a screenshot of the figma:
{F1043714}
Linear task: https://linear.app/comm/issue/ENG-5937/calendar-ui-updates
Depends on D10568