feat(color): Add utility classes used in top header

mentioned in commit ecf90301

mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!227 (merged)

mentioned in merge request gitlab!135346 (merged)

mentioned in merge request gitlab-docs!4355 (merged)

mentioned in merge request status-page!883 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3598 (merged)