feat: add gl-sm-border-l-none util class

mentioned in commit 26270393

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!2420 (merged)

mentioned in merge request status-page!305 (merged)

mentioned in merge request gitlab!64213 (merged)

mentioned in merge request gitlab-docs!1958 (merged)

mentioned in merge request gitlab-docs!1959 (closed)