fix(Gap): remove `gl-gap-y-6` addition

mentioned in commit 0a60a90c

mentioned in merge request status-page!893 (merged)

mentioned in merge request gitlab!143902 (merged)

mentioned in merge request gitlab-docs!4595 (closed)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3734 (merged)

mentioned in merge request gitlab-org/frontend/playground/accessibility-scanner!26 (closed)

mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!300 (merged)