Expose user email address to admins in group and project members API

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Problem to solve

Admins need ability to get group and project member email addresses easily via API.

Currently for example if you want to get project owner email addresses for a project you must:

1. Find owners - overly complicated - feature request #230019, bug #219299 (closed)
   1. Pull project to see if it's a personal namespace project as indicated by owner being set GET /projects/:id https://docs.gitlab.com/ee/api/projects.html#get-single-project
   2. If not personal namespace project
      1. Pull project members GET /projects/:id/members/all https://docs.gitlab.com/ee/api/members.html
      2. Client side, filter list to only owners
2. Get owner email addresses
   1. For each owner get email via GET /users https://docs.gitlab.com/ee/api/users.html#for-admins
      • Request is slower/larger than needed because can't use GET /users/:id/emails https://docs.gitlab.com/ee/api/users.html#list-emails-for-user due to it missing users primary email address #25077 (closed)

Intended users

User experience goal

The admin should be able to easily get email addresses for members of group or project via API.

Proposal

Expose email in GET /groups/:id/members/* and GET /projects/:id/members/* endpoints https://docs.gitlab.com/ee/api/members.html

NOTE: This endpoint incorrectly shows that it returns an email already. It does not in most cases.

Further details

Permissions and Security

Documentation

Update examples at https://docs.gitlab.com/ee/api/members.html

Availability & Testing

What does success look like, and how can we measure that?

What is the type of buyer?

Is this a cross-stage feature?

Links / references