Revert "Convert to modulemd-packager-v3 format"
    
    This reverts commit 9d82672a77e945a9c6eb2cca07cfc2ea5052a09f because
    MBS mismatches contexts for depending modules. E.g. building perl:5.32
    for platform:f34 fails because a buil-required perl-bootstrap:5.32
    does not run-require any platorm and thus MBS chooses a wrong
    perl-bootstrap context for platform:f35.
    
    <https://pagure.io/fm-orchestrator/issue/1714>