[REFACTOR] - Revise the game tracker and matches result

[tvillegas98]

There are a few things to revise here:

• The game tracker is mainly focused on the battle game mode.
• In the game tracker, we have a position_on_death, while in the game state, the player's match position is tracked in a different way.
• Prestige is hardcoded! We should refactor this.
• There's a TODO note mentioning that the death count works only because players die just once 😆. This is no longer the case.

Also, when anytime we're calculating or putting the position of the player in a match, we do this:

    {client_id, _player_id} =
      Enum.find(game_state.client_to_player_map, fn {_, map_player_id} -> map_player_id == player_id end)

Maybe we can insert the client id in the player's structure and avoid having to do this. Or invert the map so we have the player as the key and the value as the id