fix photon trigger container for Heavy_ions
In Heavy-Ion trigger setup, ion, the HLT CaloEMClusters containers for electrons and photons were merged into one losing information of individual objects links.
This MR creates a new container for each object, electron, and photon. Creating new Keys and modifying the EDM.
Tagging HI trigger coordinator @asmaga @jkremer, HI Conveners @mrybar @angerami @qhu