refactor(client): `readMessage` events (#28709)

apps/meteor/client/startup/index.ts

apps/meteor/client/startup/readMessage.ts

apps/meteor/client/views/room/components/BlazeTemplate.tsx

apps/meteor/client/views/room/components/body/RoomBody.tsx

.../client/views/room/components/body/hooks/useDropTarget.ts

...ews/room/components/body/hooks/useFileUploadDropTarget.ts

.../room/components/body/hooks/useReadMessageWindowEvents.ts

...nt/views/room/components/body/hooks/useRetentionPolicy.ts

...views/room/components/body/hooks/useRoomMessageContext.ts

...iews/room/components/body/hooks/useRoomRolesManagement.ts

...ent/views/room/components/body/hooks/useUnreadMessages.ts

...lient/views/room/contextualBar/Info/RoomInfo/RoomInfo.tsx

...iews/room/contextualBar/Threads/components/ThreadChat.tsx

apps/meteor/client/views/room/providers/RoomProvider.tsx