EGM GED bug fixes for pre12 (AOD size, cluster double counting, rechit fraction usage)

Built ontop of pre11.

This PR includes various bugfixes and improvements to AOD size:

- Fix to properly use rechit fractions for eta/phi width
- Fix to produce BasicCluster collections for PF-SCs (instead of ref'ing back to particleFlowClusterECAL)
- Fix photon pixel seed veto not being properly filled.
- Fix cut on photon SC eT to be consistent across all GED photon producers.
- Fix instance of cluster double counting that could happen in PFEGammaAlgo.
- Consistent renaming of SuperCluster accessors.
- Cut to reduce PF-ECAL SuperCluster collection.
- Reduced size to interesting rechit collections for PF-ECAL SCs
- Import PFClusters of PFSCs by edm::Ref instead of by fraction and overlap