EXOT8: Adding TruthEvents

Jason Robert Veatchrequested to merge
jveatch/athena:21.2-EXOT8 into 21.2

This adds TruthEvents to EXOT8, which were mistakenly removed previously. This has no impact on data derivation sizes and a ~5% increase for MC derivations.

Tagging @mswiatlo, @cdelitzs, and @kkrizka

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