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.