[HIGH] Teacher approvement of invited via access code students

[deespater]

Every student who has visited the invite link or access code for course join is put to the "Unconfirmed" section and won't be able to see and/or interact with course page untile Teacher confirms their access from page "Members"

This is implemented to prevent unauthorized access to course

[artem-chechoro]

Unconfirmed students should not see in global feed messages of students which were assigned

[artem-chechoro]

Done