Show old versions of a room in a space even if that space has been updated with the new room

### Your use case

#### What would you like to do?

Let's consider room 1 in a space. Room 1 is upgraded to room 2, and the space is updated with room 2 as a child instead of room 1. As a member of room 1 who hasn't joined room 2 yet, I would expect Element to show room 1 in the space, but it currently moves it to the "Home" section (since room 1 is not strictly speaking part of the space anymore).

#### Why would you like to do it?

I find it super confusing to have a room suddenly disappear from a space because the admin upgraded it. On top of that, room 1 might be referenced by other spaces which haven't been updated yet, so the room might move to somewhere other than "Home", which means the user may need to look through all of their spaces to find it.

#### How would you like to achieve it?

Element could look at a tombstone event in room 1 when the space is updated, and if that event points to a room that's in the space it could show the room as in that space.

### Have you considered any alternatives?

I can't find any other than having the user look manually through Home and all of their spaces for the missing rooms.

### Additional context

_No response_