Update the message previews text displayed in Favourites/People/Rooms tabs

Following on from https://github.com/vector-im/element-ios/issues/4451, the strings displayed in the rooms lists can be unhelpful for some message types.

Media shows without any indication of the attachment type:
> **Alice:** File Name

Replies show who was replied to but no content:
> **Alice:** In reply to Bob

It would be nice to match the strings used for notifications in #4132, however it would be worth thinking about this a bit given the current sender name prefix style:

> **Alice:** replied Hello
> **Alice:** sent a Voice Message

@niquewoodhouse I think you mentioned about whether having the sender name has value in DMs for example.

**Update:** An additional message type that needs to be considered is when a room has been created but has no other events that should be displayed. Using the creation event gives the string:
> ∙ You created and configured the room.

Screenshot of these:

Start by tracing the message preview strings used in the Favourites, People, and Rooms tabs, then compare them with the notification strings referenced in #4132. Done means media previews identify the attachment type, replies include useful content, and newly created rooms have an appropriate preview.

Written by the indexing model from the issue text.