Bug 24879: (follow-up) Fix test suite

Bug 24879: (follow-up) Fix test suite

Running cataloguing pluings (in cataloguing/value_builder) now requires
authentification.

This patch adds in failing unit tests a mock of C4::Auth::check_cookie_auth

Test with:
prove t/db_dependent/FrameworkPlugin.t t/db_dependent/Koha/UI/Form/Builder/Biblio.t t/db_dependent/Koha/UI/Form/Builder/Item.t t/db_dependent/Serials.t

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>