feat(GlLink): adding deprecated export for upcoming breaking changes

mentioned in commit 51aa1f62

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

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

mentioned in merge request status-page!903

mentioned in merge request gitlab!146672 (merged)

mentioned in merge request gitlab!146682 (closed)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3770 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3771 (merged)