add HLT_FastPhotons container to Run3 photon trigger container list for EGAM derivations
as requested here: https://its.cern.ch/jira/projects/ATLEGAMDPD/issues/ATLEGAMDPD-206 by @jlieberm
as requested here: https://its.cern.ch/jira/projects/ATLEGAMDPD/issues/ATLEGAMDPD-206 by @jlieberm