Paginate all the things
What does this MR do?
It paginates all endpoints which return an array but do not use pagination
What are the relevant issue numbers?
Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/8099, https://gitlab.com/gitlab-org/gitlab-ce/issues/1746, https://gitlab.com/gitlab-org/gitlab-ce/issues/20236, https://gitlab.com/gitlab-org/gitlab-ce/issues/20248, https://gitlab.com/gitlab-org/gitlab-ce/issues/23302, https://gitlab.com/gitlab-org/gitlab-ce/issues/14791, #27306 (closed)