[SM] Create transparency about User Overage process
# Summary Part of the QSR initiative to bring transparency to user overage process. Epics for SaaS work: - https://gitlab.com/groups/gitlab-org/-/epics/7229+ - https://gitlab.com/groups/gitlab-org/-/epics/7230+ ### Possible solutions: 1. Add messaging about user overage process to purchase flow 2. Add messaging about user overage process to user invite/management flow 3. Send introductory email about user overages after purchase or renewal (After a GitLab subscription has been purchased or renewed, email the sold to contact to make them aware of how users are counted and how overages are handled) 4. Send a monthly email detailing seat usage and possible overages - https://gitlab.com/groups/gitlab-org/-/epics/6130+
epic