Assign managers to users and map value in the system address book

[ChristophWurst]

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Is your feature request related to a problem? Please describe.

As an organization admin I want to be able to define the hierarchy of the organization inside of Nextcloud. This info shall be used to enhance the system address book (#19575) so that an organization chart can be drawn in the Contacts app (nextcloud/contacts#2726).

Describe the solution you'd like

Extend the user management UI to have a dropdown for a user's manager. This can be any other Nextcloud user or nobody.

Describe alternatives you've considered

N/a

Additional context

#37800

[ChristophWurst]

@jancborchardt @nimishavijay could you describe where in the UI we should place this?

[ChristophWurst]

I'm looking into the backend storage of the new manager(s) property for users

[jancborchardt]

@jancborchardt @nimishavijay could you describe where in the UI we should place this?

It seems fine as the very last property on the right (even behind the optional ones like last login etc.).

[ChristophWurst]

@hamza221 please post a screenshot of the select component placed as last property so we can have a short design feedback loop