move testing of common tags of test files to a new data-driven test for taglibextractor

Summary:
As a preparation for more test data, move all tags that
have a direct implementation by taglib itself to a common
test function. New tag formats can then be tested for the
most common tags, which is needed for a following
patch.

Reviewers: bruns, svuorela

Reviewed By: bruns

Subscribers: kde-frameworks-devel, Baloo

Tags: Frameworks, Baloo

Differential Revision: https://phabricator.kde.org/D15825