Added more colections to ESD +implemented naming convention
This MR adds two more collections two trigger ESD content, HLT_L2Electrons and HLT_xAODTracks The later will be updated to be different for electrons & muons. This will be followed up by muon related collections. I am not going to touch things that are not yet moved to TriggerMenuMT to avoid clashes with migration. Tagging @bernius and @tamartin.