"You invited %1$@" still shows a matrix id

[manuroe]

Steps to reproduce

This is a bug found by Hans while testing element-hq/element-meta#2395.

1. Open DM you started
2. Expand the room changes
3. The app displays ""You invited @bob:matrix.org" instead of Bob

Outcome

What did you expect?

A display name instead of a matrix id like on EW:

The invite event has a displayname field:

{
  "content": {
    "displayname": "testiosr123",
    "is_direct": true,
    "membership": "invite"
  },
  "origin_server_ts": 1663321374100,
  "sender": "@Manu:matrix.org",
  "state_key": "@testiosr123:matrix.org",
  "type": "m.room.member",
  "unsigned": {
    "age": 52463967527
  },
  "event_id": "$ryCuR93bduTjs-u5CPZQPNPnZZK_AQtp2_4Ys2SUXxk",
  "room_id": "!hQMQdhNMYBzbNfRaKh:matrix.org"
}

[jmartinesp]

Added matrix-org/matrix-rust-sdk#3428 as a first step to get the required display name.