This diff introduces the `vipPendingUsers` state. Based on the design requirements in the figma we only want to move users in and out of the vip section whenever the modal view changes into "search mode" (whenever `searchText` changes).
> We should not jump the members on their own, they will only be moved when the modal “changes” views when a user searches and then clears.
{F1088704}
{F1088706}
Subsequent diffs will handle introducing the vip users to the UI.
Linear task: https://linear.app/comm/issue/ENG-5960/selected-users-section
Depends on D10819