Add gitlab-templates code owners
Add gitlab-templates code owners

With https://gitlab.com/gitlab-org/gitlab-ce/issues/50289 we moved CI
templates into gitlab repository.

The previous gitlab-ci-yml maintainers are now marked as code owners.
Auto DevOps is assigned to configure team backend developers.

mmkassem/gitlabhq,iiet/iiet-git,dreampet/gitlab,axilleas/gitlabhq,dreampet/gitlab,stoplightio/gitlabhq,dreampet/gitlab,axilleas/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,iiet/iiet-git,iiet/iiet-git,mmkassem/gitlabhq,axilleas/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,stoplightio/gitlabhq,axilleas/gitlabhq,iiet/iiet-git,dreampet/gitlab