Admin action - Make user from a contact

Have the admin action to make a user from a contact available to a user. (like a user can do when a they are an admin etc.)

This page has what the app screen should do:
https://dtdemo.disciple.tools/user-management/add-user/

Review the linked user-management page to understand the expected app screen, then locate the mobile admin actions for contacts and user management. Implement the available action for creating a user from a contact, and verify that the resulting flow matches the referenced screen and is restricted appropriately for admins.

Written by the indexing model from the issue text.