Add option to export EAD like public user in CLI

(Ported from a810365fc50e24ee57a97643864ce11aefd7f989 by jraddaoui.)

If the '--public' option is added when executing the exportBulk task
draft descriptions (and their descendants) are not added in EAD export.
It won't add physloc either if physical storage is hidden for public user

Refs #7743