Add engineering code owners
https://docs.gitlab.com/ee/user/project/code_owners.html
If we add this, then approvers will be set on an MR automatically depending on the paths it matches.
However, we shouldn't do this until https://gitlab.com/gitlab-org/gitlab-ee/issues/1979 is resolved, as the current system would create todos for every automatically-added approval, which is quite spammy: https://gitlab.com/gitlab-org/gitlab-ee/issues/8396#note_123653936
cc @edjdev
Edited by Sean McGivern