WIP: Execute review app tests in parallel via the parallel_tests gem
What does this MR do?
Extends https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/29654 and https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/30113 by enabling the --parallel
option for review apps.
This shouldn't be merged until after https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/30113 when we're confident the tests can safely run in parallel.
Does this MR meet the acceptance criteria?
Conformity
Edited by Mark Lapierre