This change introduces a builting query to easily list
Administrators of your beautiful Phorge instance:
Note that any builtin query can be disabled anytime or
reordered, so this is not a problem if you already have
a similar saved query. But probably you have not.
The goal is not to just "have a link" (this was already
possible) but to have a predictable link to be used in
any instance-agnostic document, including but not
limited to Diviner or Phorge's user interface messages.
Closes T15238
