try to recover timing for LRTElectrons even if cell link to LRTegammaCluster not there

For Run2 reprocessing, LRTegammaCluster cell_links were not saved in the AOD. One can try to recover some cell information for the LRTElectrons if a regular egammaCluster matches the LRTegammaCluster. This MR is trying to implement this. When scheduling the MaxCellDecorator augmentation tool (e.g. in LLP1.py jobOption) one could use the r-tag of the input AOD to identify a Run2 reprocessing output and decide whether to apply this (approximate) fix.

For Run3, the cell links were added to the AOD in this merge request !52256 (merged)

ping @gmarchio as derivation expert and @ancsmith and @longjon as interested users