Resetting progress on a game should wipe leaderboard entries if the user is Untracked

[wescopeland]

Describe the bug
Currently when a user resets progress on a game, their leaderboard entries are left intact. Leaderboard entries should also be wiped, but only if the user is Untracked or unranked_at.

Additional context
If possible, do a soft delete, that way we can restore the entries later.