Scoped labels for GitLab.org

We will have scoped labels soon. See https://gitlab.com/gitlab-org/gitlab-ee/issues/9175

Let’s use this as a place to discuss using scoped labels for many of the labels throughout GitLab.org, including the ones documented in https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/contributing/issue_workflow.md

Issue type

• ~feature -> type::feature
• ~bug -> type::bug

Priorities and severities

• ~P1 -> P::1
• ~S1 -> S::1

DevOps stage

• ~"devops:plan" -> devopsplan

Team

• ~Plan -> team::plan

Tier

• GitLab Starter -> tier::Starter