Group level code owners
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=332036) </details> <!--IssueSummary end--> <!-- This template is a great use for issues that are feature::additions or technical tasks for larger issues.--> ### Proposal [Code owners](https://docs.gitlab.com/ee/user/project/code_owners.html) is currently only supported at the project level. This request is to enable code owners at the group level. The typical use case is that a business unit (BU), which maps to a top level group in GitLab, will need to set up code owner rules for all their projects. For example, all .gitlab-ci.yaml files must be reviewed by the BU’s CICD champions team. Customer request: https://gitlab.my.salesforce.com/00161000004zrG3
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