Add support for detecting the Hyperscale variant in liveinst
    
    Anaconda does not rely on os-release(5) data directly to determine
    which product data to load, but instead needs either a /.buildstamp
    file or logic to populate environment variables to have Anaconda
    select the right configuration.
    
    This change adds logic to set the ANACONDA_PRODUCTVARIANT variable
    when the Hyperscale variant is detected on the system.