* Write failing playwright test
Basically when someone changes their name, any old tombstoned rooms that
were previously hidden would suddenly show up in the list.
* Split addRoom into two methods
- `reInsertRoom` that re-inserts a room that is already known by the skiplist.
- `addNewRoom` to add new rooms
The idea is that sometimes you only want to re-insert to noop, eg: when
you get an event in an old room that was upgraded.
* Use new methods in the RLS
Only use `addNewRoom` when absolutely necessary. Most events should
instead use `reInsertRoom` which will noop when the room isn't already
known by the skiplist.
* Fix broken tests
* Add new test
* Fix playwright test
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