CI Tests: Set DEBUGINFOD_URLS based on test FMF context.
    
    Tests are supposed to be executed within defined context, such as e.g.
    tmt --root . -c arch=x86_64 -c distro=fedora-38 -c trigger=build run ...
    
    FTR: https://tmt.readthedocs.io/en/stable/spec/plans.html#context
    
    This update sets DEBUGINFOD_URLS based on the provided distro
    via the ci.fmf file.