feat(GlAreaChart): add legend-series-info prop

mentioned in commit 98cf5e4d

mentioned in merge request status-page!751 (closed)

mentioned in merge request gitlab!116736 (merged)

mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!133 (merged)

mentioned in merge request status-page!752 (merged)

mentioned in merge request gitlab!116885 (merged)

mentioned in merge request gitlab!117076 (merged)

mentioned in merge request gitlab-docs!3751 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3341 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3342 (merged)