An alternative implementation of !52194 (closed). As we do not have Run 3 data yet we may want to fully disable the PRW in some cases and just copy run/lumiblock number as random. Fixes ATLASG-1628.
This method does not require any dummy files but PHYSLITE configuration is still hacked a bit. Probably longer term we should configure GRL/lumicalc files from the PHYSLITE configuration itself (cc @jcatmore).