Allow GRID files to be added to preexisting DSIDs if they have different COM energy

Changes introduced

• Allow GRID files with different COM energy to be added to a pre-existing DSID
• Rearrange checks so that all checks for added files happen in check_added_files.sh and all checks for modifications happen in check_modified_files.sh

Tests

From https://gitlab.cern.ch/atlas-physics/pmg/mcjoboptions/-/pipelines/3117105

I added a file with a 13p8 COM energy which passes and a file with 13TeV COM energy (but different name) which fails. I guess this is what we want

The check_modified_files job passes in this pipeline and only check_added_files fails because these tests have now been moved there.

Issues resolved

Closes #151 (closed)