refactor: Abandon `useSyncExternalStore` shim (#35051)

...mnichannelRoomIcon/context/OmnichannelRoomIconContext.tsx

...ichannelRoomIcon/provider/OmnichannelRoomIconProvider.tsx

apps/meteor/client/contexts/CallContext.ts

apps/meteor/client/hooks/usePresence.ts

apps/meteor/client/hooks/useReactiveValue.ts

apps/meteor/client/hooks/useUserData.ts

apps/meteor/client/lib/RoomManager.ts

apps/meteor/client/providers/ModalProvider/ModalProvider.tsx

apps/meteor/client/views/account/AccountSidebar.tsx

apps/meteor/client/views/admin/EditableSettingsContext.ts

apps/meteor/client/views/admin/sidebar/AdminSidebarPages.tsx

apps/meteor/client/views/banners/BannerRegion.tsx

apps/meteor/client/views/marketplace/MarketplaceSidebar.tsx

...r/client/views/omnichannel/sidebar/OmnichannelSidebar.tsx

...t/views/room/Header/Omnichannel/OmnichannelRoomHeader.tsx

...r/client/views/room/Header/Omnichannel/VoipRoomHeader.tsx

...views/room/HeaderV2/Omnichannel/OmnichannelRoomHeader.tsx

...client/views/room/HeaderV2/Omnichannel/VoipRoomHeader.tsx

...ews/room/MessageList/contexts/SelectedMessagesContext.tsx

...s/room/MessageList/providers/MessageHighlightProvider.tsx