Include whether an email is verified in the /user/emails API endpoint result
### Problem to solve The API result from /user/emails (https://docs.gitlab.com/ee/api/users.html#list-emails) does not indicate whether an email is verified or not. Emails other than the user's primary email can therefore not be used by 3rd-party integrations/apps to validate user identity. For example, see https://github.com/sourcegraph/sourcegraph/commit/8d13522add2cd1f5da6bee0222c31f15c8ab5cd1 ### Target audience 3rd-party developer who wants to validate a user's identity against their GitLab identity. ### Further details See above. ### Proposal Just return a boolean indicating whether an email is verified, like the GitHub API does. ### What does success look like, and how can we measure that? Self-evident ### Links / references N/A
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