Add small prop to PeopleSearch components for reduced height

- Add small prop support to PeopleSearch component
- Pass small prop to PeopleSearch in AttendeeSearch
- Use small prop in EventFormFields Participants field
- Use small prop in TempCalendarsInput for left sidebar

src/components/Calendar/CalendarSearch.tsx

@@ -275,6 +275,7 @@ export default function CalendarSearch({
       <PeopleSearch
         objectTypes={["user"]}
         selectedUsers={selectedUsers}
+        small
         onChange={async (event: any, value: User[]) => {
           setSelectedUsers(value);