Add Marcel as a CI template codeowner

Marcel Amiraultrequested to merge
ci-templates-maintainer-marcel into master

What does this MR do?

Adds myself as a codeowner for the CI templates, the second step as part of becoming a template maintainer. See: gitlab-com/www-gitlab-com#10835 (closed)

Related to gitlab-com/www-gitlab-com#10835 (closed)

Edited by Marcel Amirault

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