Add possibility to run over group.phys-gener files
Description of bug
CI could not download files with group.phys-gener scope
Changes introduced
If input LHE file contains group.phys-gener then use group.phys-gener as scope otherwise use mc15_13TeV
Tests
The issue is solved as shown here:
https://gitlab.cern.ch/atlas-physics/pmg/mcjoboptions/-/jobs/15458770
Issues resolved
Closes #