Investigate impact of adding theory-driven photon cuts which solve linear-term sensitivity in IR region

More details in slide here: https://indico.cern.ch/event/1253164/contributions/5353977/attachments/2639659/4567784/CMS_Higgs_Caola.pdf

Check impact on signal acceptance (propagating to sensitivity).

If small then change diphoton preselection in HiggsDNA to align with these cuts