feat(css): add gl-column-gap-6 util
What does this MR do?
Adds .gl-column-gap-6
CSS util, to be used in gitlab-org/gitlab-services/design.gitlab.com!3021 (merged).
Adds .gl-column-gap-6
CSS util, to be used in gitlab-org/gitlab-services/design.gitlab.com!3021 (merged).