Avoid resetting device id when removed from push proxy (#28269)

* Avoid resetting device id when removed from push proxy

* Fix test and minor improvements

* Add MySQL support

server/channels/app/notification_push.go

@@ -530,7 +530,9 @@ func (a *App) sendToPushProxy(msg *model.PushNotification, session *model.Sessio
 
 	switch pushResponse[model.PushStatus] {
 	case model.PushStatusRemove:
-		a.AttachDeviceId(session.Id, "", session.ExpiresAt)
+		a.SetExtraSessionProps(session, map[string]string{
+			model.SessionPropLastRemovedDeviceId: session.DeviceId,
+		})
 		a.ClearSessionCacheForUser(session.UserId)
 		return errors.New(notificationErrorRemoveDevice)
 	case model.PushStatusFail: