**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**
The add users modal is getting a brand new ui + ux. This diff updates the add users list item ui to match the new checkbox ui/ux.
For context here is what the new add users modal looks like:
{F1071696}
Linear task: https://linear.app/comm/issue/ENG-5957/update-the-ui-of-add-friends-modal
Depends on D10719