EZP-22324: Implemented premium subscriber content

A custom location view provider displays a teasing template
if the content is Premium (section id 7 (Premium)), and if the
user doesn't have the subscriber role (id: 6)

section_id and role_id are configured in default_settings.yml.

(cherry picked from commit 9c5b83bff701e5c9d56cc3f4efb540f3477eb7a4)
EZP-22324: BDD tests for premium content

(cherry picked from commit fbb2fd887484f5fdaa8153471eabe27e1ae0905e)
EZP-22324: updated premium content scenarii

(cherry picked from commit 8a812d4edf44ffdf8d27f2eb5dd3f0d6c3944453)
Updated tag cloud tests to demo content

(cherry picked from commit 46293b42dd0b2f9d95f87be238f60bada5de204d)