feat: Add public_email to CreateUserOptions

Mohamed Othmanrequested to merge
gitlab-community/gitlab-org/api/client-go:add-public-email-to-create-user-options into main

Add support for the public_email attribute when creating users.

This unblocks Terraform MR (gitlab-org/terraform-provider-gitlab!2942) that relies on setting public_email via the GitLab Users API.

Other missing create-user attributes will be added in a separate follow-up MR.

Closes #2236 (closed)

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