Users: Two different screens for adding a new users on WoA sites

[mmtr]

Issue reported during walkthrough: p58i-iKo-p2

On WoA sites with the default admin interface active, there are two competing screens for adding a new user to the site:

They link to two different screens and it's not clear when one should be used over the other. Can they link to the same screen like they do on Simple sites?

[github-actions]

OpenAI suggested the following labels for this issue:

• [Feature Group] User Management: The issue discusses the screens for adding new users, which falls under user management functionality.
• [Feature] Authentication: The processes involved in adding users may involve account credentials, linking this to authentication features.
• [Feature] Signup & Account Creation: The issue specifically relates to creating new user accounts, aligning with signup processes.