fix: install MediaArea packages only from official MediaArea repo

Changes

• Run molecule verify stage during GitLab-CI
• Bump MediaArea repository package version to 1.0-24
• Make sure to install MediaArea packages (mediaconch, mediainfo and dependencies) only from the official MediaArea repo
• Clean up all the places where we installed mediaconch/mediainfo before
• Add tests to make sure that mediaconch can be run as expected

Reasoning

Previous versions of this role did not distinguish between mediaconch/mediainfo being installed from EPEL or directly from MediaArea. That meant that nonfunctional versions of the MediaArea tools might get installed on RHEL 8, resulting in broken file validation/MDextraction. After @romeyke noticed that there's a problem with validation on SLUB's Rosetta servers, we have added these changes to make sure the correct version is installed.

Before fixing, we encountered these errors when invoking mediaconch:

mediaconch: symbol lookup error: mediaconch: undefined symbol: _ZN6ZenLib4File4OpenERKNSt7__cxx1112basic_stringIwSt11char_traitsIwESaIwEEENS0_8access_tE
mediaconch: symbol lookup error: mediaconch: undefined symbol: _ZN12MediaInfoLib9MediaInfo13Option_StaticERKNSt7__cxx1112basic_stringIwSt11char_traitsIwESaIwEEES8_

!!! ATTENTION !!!

If your server already has the wrong versions installed, please resolve the situation manually before running this Ansible role again. Ansible has no way of reinstalling a package from another repo.