Managing multiple product categories in GitLab

What this post added

This post details how GitLab uses scoped labels (`stage::name`, `group::name`, `category::name`, `type::name`, `workflow::state`) and group-level issue boards to manage multiple product teams contributing to a single repository. It also explains the use of group milestones for release cadence. It introduces the concept of standardizing workflows across teams for better visibility and introduces the idea of rollup issue boards.