ATR-24283 : add monGroups for MET chains, add missing/correct wrong monGroups for egamma and tau chains
- add monGroups requested by MET, tagging @khamano to verify
- add egammaMon:online and switch to egammaMon:shifter for HLT_e60_lhmedium_L1EM22VHI (overlooked previously), tagging @cjmeyer @jodafons
- keep only the most inclusive monGroup for HLT_tau180_mediumRNN_tracktwoLLP_L1eTAU140, tagging @gipezzul @iriu