New room list: add search section (#29251)

* feat(new room list): move `RoomListView` to its own folder and add styling

* feat(new room list): add search section

* test(new room list): add tests for `RoomListSearch`

* test(new room list): add tests for `RoomListView`

* test(e2e): add method to close notification toast to `ElementAppPage`

* test(e2e): add tests for the search section

* test(e2e): add tests for the room list view

* refactor: use Flex component

* fix: loop icon size in search button

* refactor: remove `focus_room_filter` listener

src/components/structures/LeftPanel.tsx

@@ -390,7 +390,7 @@ export default class LeftPanel extends React.Component<IProps, IState> {
             return (
                 <div className={containerClasses}>
                     <div className="mx_LeftPanel_roomListContainer">
-                        <RoomListView />
+                        <RoomListView activeSpace={this.state.activeSpace} />
                     </div>
                 </div>
             );