Expose previous names of renamed users to admins only
Summary:
Restrict exposure of the previous username(s) of a renamed user to Phorge admins only. The previous username is not of particular interest to most users, and dropping the previous username from the public UI reduces the chances of deadnaming.
Closes T16276
Test Plan:
* As an admin, rename a user account several times.
* Look at the entries on http://phorge.localhost/feed/ as an admin (no changes) and as an average user (old names not shown).
* Look at the entries on http://phorge.localhost/people/manage/2/ as an admin (no changes) and as an average user (old names not shown).
Reviewers: O1 Blessed Committers, mainframe98
Reviewed By: O1 Blessed Committers, mainframe98
Subscribers: mainframe98, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno
Maniphest Tasks: T16276
Differential Revision: https://we.phorge.it/D26366