Medical Assistant kind of sucks for learning Medical

[Glamurio]

I have a PR up to make the Assistant jobs mainstay for newbees by limiting them to people who have not played a lot yet, which I think is a good change as it makes newbees more recognizable ingame and avoids veterans picking assistant jobs when the real jobs are filled and then just play it as if they weren't assistants.

Admins seem favorable to giving them more access if they are limited to new players.

Thread:
https://forum.ss13.co/showthread.php?tid=22810

PR:
https://github.com/goonstation/goonstation/pull/19165