[MC-261082] Player team entries are stored as player names

Whenever a player gets added to a team, their name gets stored in the Players key, instead of their UUID.

This will cause issues in two scenarios:

If a player is added to a team, quits the game, changes their name and then rejoins the server, they'll be removed from the team.
If in the future longer names are supported, a player could name themselves as a UUID and cause potential issues.

Linked issues

Duplicate of MC-50247, teams are part of the scoreboard system and used to be the same command (at time it got WAI'd).

Thank you for your report!
We're tracking this issue in MC-50247, so this ticket is being resolved and linked as a duplicate.

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