Merge branch 'morefice/expand-keep-milestone-helper' into 'master'

Add upcoming_milestones helper

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/169606



Merged-by: Kev Kloss <kkloss@gitlab.com>
Approved-by: Rémy Coutable <remy@rymai.me>
Approved-by: Kev Kloss <kkloss@gitlab.com>
Reviewed-by: Rémy Coutable <remy@rymai.me>
Co-authored-by: Maxime Orefice <morefice@gitlab.com>