Add loading state to the new room list view (#29725)

* add loading state to view model and spinner to room list vieqw

* Update snapshots and add loading test

* avoid nested ternary operator

* Add room list skeleton loading state

* Fix loading logic

- Create RoomListStoreV3Event as to not conflict with loading event definition in Create RoomListStoreEvent.
- Add a loaded event
- Use it to determine loaded state in useFilteredRooms rather than the update event which gets fired in other cases.

* Fix isLoadingRooms logic

* update snapshots and fix test

* Forcing an empty commit to fix PR

* Fix _components.pcss order

* Fix test that wasn't doing anything

* fix tests

test/unit-tests/components/viewmodels/roomlist/RoomListViewModel-test.tsx

@@ -9,9 +9,8 @@ import { range } from "lodash";
 import { act, renderHook, waitFor } from "jest-matrix-react";
 import { mocked } from "jest-mock";
 
-import RoomListStoreV3 from "../../../../../src/stores/room-list-v3/RoomListStoreV3";
+import RoomListStoreV3, { LISTS_UPDATE_EVENT } from "../../../../../src/stores/room-list-v3/RoomListStoreV3";
 import { mkStubRoom } from "../../../../test-utils";
-import { LISTS_UPDATE_EVENT } from "../../../../../src/stores/room-list/RoomListStore";
 import { useRoomListViewModel } from "../../../../../src/components/viewmodels/roomlist/RoomListViewModel";
 import { FilterKey } from "../../../../../src/stores/room-list-v3/skip-list/filters";
 import { SecondaryFilters } from "../../../../../src/components/viewmodels/roomlist/useFilteredRooms";