Activity page should list user invite and deletion events

Release notes

Problem to solve

Group members wish to view at least a rudimentary audit trail of inviting and removing users or of users deleting their account.

Proposal

The /-/activity page of groups and projects should list Was invited to … (by @…), Deleted their account, etc.

Intended users

• Cameron (Compliance Manager)
• but also all users who can currently see the Team events already

Feature Usage Metrics

This page may contain information related to upcoming products, features and functionality. It is important to note that the information presented is for informational purposes only, so please do not rely on the information for purchasing or planning purposes. Just like with all projects, the items mentioned on the page are subject to change or delay, and the development, release, and timing of any products, features, or functionality remain at the sole discretion of GitLab Inc.