"Always subscribe me to mailing lists" does not work everytime

mailing_list_auto_subscribe_policy rules are explicitly disabled when joining a restricted or moderated team. While this is clear in the code, There is not other documentation about this. The rules are only enforced in the browser--the policy is always ignored when users are subscribed over API.

I think this is wrong. A better implmentation is to /subcribe/ a function for mailing_list_auto_subscribe_policy to the team join event. There is not event though :( We want membership status changes to emit an event that functions can subscribe to. I think the odd rules are caused by the delay in setting the TeamMembship status to approved. If something could watch the status change to approved, subscriptions would be honoured on the api and the browser. (we could also defer sending email notifications too)