Show infos section on Staging Workflow layout

The Infos section, on the right side, contains some lists of projects
and requests available to be associated to the Staging Workflow in some
different ways.

Co-authored-by: David Kang <dkang@suse.com>
Co-authored-by: Eduardo Navarro <enavarro@suse.com>
Co-authored-by: Saray Cabrera Padrón <scabrerapadron@suse.de>