Add more gitlab-shell maintainers

Overview

Approximately 12 months ago, 3 of the 5 gitlab-shell maintainers worked in the team responsible for the project (Source Code BE) with 3 maintainers now being reduced to 1 maintainer.

Proposal

I believe it's critical for gitlab-shell to have maintainers who actively work in and responsible for the project and so I'm proposing we add at minimum 1 and ideally 2 additional gitlab-shell maintainers from the Source Code BE team.

To achieve the goal to become a Gitlab Shell Maintainer here are the steps to follow.

• Open an child item under this issue to apply for Maintainer status. Example
• Begin reviewing Open MR's and provide updates in the Maintainer issue.
• Gather feedback on the issue from an existing GitLab Shell Maintainer on the review checkpoints.
• Start contributing to Gitlab Shell project.

There are no strict requirements to become a maintainer for GitLab-Shell. Based on the process followed previously, to become a maintainer, we can ensure to:

• Contribute at least 3 merge requests
• Review at least 3 merge requests
• Review the codebase to be familiar with it