Adding dummy electron in TrigEgammaFastElectronFexMT to accommodate idperf chain

Debottam Bakshi Guptarequested to merge
dbakshig/athena:idperfChainSetup into master

As discussed in ATR-21217 this MR is to accommodate electron idperf chain by adding a dummy electron in TrigEgammaFastElectronFexMT. Adding @tamartin , @sutt , @fernando , @cjmeyer

Edited by Debottam Bakshi Gupta

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