[entity] Stop linking to external site for external entities This behaviour was ok when we had "true" multi-sources but its rather painful with datafeed sources. Also, it makes absolute_url() costlier than what it should. Besides, it relies on cw_metainformation()['source'] that is pending for removal. Instead, add a link to the original object in the metadata view (the one that displays eid and source at the bottom right corner of the primary view). Related to #15538288.

.. _authplugin_module:

:mod:`cubicweb.pyramid.authplugin`
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.. automodule:: cubicweb.pyramid.authplugin

    .. autoclass:: DirectAuthentifier
        :show-inheritance:
        :members: