If a group's messageable_level is set to nobody then staff can't should not be able to send PMs to it.
Co-authored-by: Martin Brennan <martin@discourse.org>
It's very easy to forget to add `require 'rails_helper'` at the top of every core/plugin spec file, and omissions can cause some very confusing/sporadic errors.
By setting this flag in `.rspec`, we can remove the need for `require 'rails_helper'` entirely.