[utils] Drop now-unused SizeConstrainedList
It's last usage in CubicWeb got removed from changeset '[views] remove
breadcrumbs usage to retrieve last visited page'
Related to #5456850.
# -*- coding: utf-8 -*-
# copyright %(year)s %(author)s, all rights reserved.
# contact %(author-web-site)s -- mailto:%(author-email)s
#
%(long-license)s
"""%(distname)s specific hooks and operations"""