[FTAG] add flipped GNN taggers to output and fix flipping logic

This MR modifies the flipped tagger logic for all GNN flavour tagging algorithms. It further adds the flipped GN1 and GN2 scores to the output in derivations, so that studies of the flipped taggers become possible.

This MR is taking the changes which @yinmiao introduced in !61905 (closed) and targets 23.0 (and not master). We decided to open a new MR to have it cleaner.