These tests were manually pushing the `PlayerLoader` / `Player`
instances to `SongSelect`, which bypasses safeties in place which avoid
the exact issue that came up in https://github.com/ppy/osu/runs/2951759236
(see `AllowSelection` flag specifically).
When looking into the test failure at https://github.com/ppy/osu/runs/2940065457, it became apparent that we are not showing the migration process anywhere in logs. It's the cause of many issues, and we would want to see this in CI and user logs when occurring.