adding missing electron iso WPs (Tight_VarRad, Loose_VarRad, TightTrackOnly_VarRad)

Closed Nils Julius Abicht requested to merge niabicht/athena:21.2-R21electronIsoWPs_try5 into master

adding missing electron iso WPs (Tight_VarRad, Loose_VarRad, TightTrackOnly_VarRad)

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