Set aggregate_failures globally for test suite
We're encouraged to use aggregate_failures
as part of our best-practice.
@cablett mentioned that as a reviewer, she often reminds people to apply it to their tests.
Should we just enable it globally?
This idea was added by @cwiesner to the gitlab-org/customers-gitlab-com
project in https://gitlab.com/gitlab-org/customers-gitlab-com/merge_requests/765 (issue customers-gitlab-com#880 (closed)).
Edited by Luke Duncalfe