Address [[ https://linear.app/comm/issue/ENG-10820/native-show-restorebackupscreen-when-restoring-backup-during-restore | ENG-10820 ]], part of [[ https://linear.app/comm/issue/ENG-10821/native-loading-indicator-after-qr-auth | ENG-10821 ]].
We delay exiting LoggedOutModal (auth navigator) until user data restoration concludes. This way, the `RestoreBackupScreen` is still displayed during the data restoration.
This has no effect when `fullBackupSupport` is false (dataReady is always true).
Depends on D14916