* Allow API to assign new user to a specific organization
* Add defer block to test
* Add API tests and return 400 instead of 500 for bad orgId
* Minor test improvements
Existing /api/alert-notifications now requires at least editor access.
Existing /api/alert-notifiers now requires at least editor access.
New /api/alert-notifications/lookup returns less information than
/api/alert-notifications and can be access by any authenticated user.
Existing /api/org/users now requires org admin role.
New /api/org/users/lookup returns less information than
/api/org/users and can be access by users that are org admins,
admin in any folder or admin of any team.
UserPicker component now uses /api/org/users/lookup instead
of /api/org/users.
Fixes#17318
