feat(label): Reduce label variants

mentioned in commit eb53383f

mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!312 (merged)

mentioned in merge request gitlab-org/frontend/playground/accessibility-scanner!28 (merged)

mentioned in merge request status-page!903

mentioned in merge request gitlab!149775 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3814 (merged)

mentioned in merge request gitlab-org/editor-extensions/gitlab-jetbrains-plugin!478 (merged)

mentioned in merge request gitlab-org/editor-extensions/gitlab-jetbrains-plugin!486 (closed)