refactor: Uses `source` instead of `room` to render the `OmnichannelRoomIcon` (#33118)

...Icon/OmnichannelRoomIcon/OmnichannelAppSourceRoomIcon.tsx

...con/OmnichannelRoomIcon/OmnichannelCoreSourceRoomIcon.tsx

...ents/RoomIcon/OmnichannelRoomIcon/OmnichannelRoomIcon.tsx

...con/OmnichannelRoomIcon/lib/OmnichannelRoomIconManager.ts

...ichannelRoomIcon/provider/OmnichannelRoomIconProvider.tsx

apps/meteor/client/components/RoomIcon/RoomIcon.tsx

...nt/views/omnichannel/directory/components/SourceField.tsx

apps/meteor/client/views/room/Header/HeaderIconWithRoom.tsx

.../meteor/client/views/room/HeaderV2/HeaderIconWithRoom.tsx

packages/core-typings/src/IRoom.ts