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Fix infinite recursion loop in truth helpers where truthparticle == truthparticle->parent()

Pierre Antoine Delsart requested to merge delsart/athena:truthdec_infloop into main

2 truth-level helper functions are recursive and can cause infinite recursion when a truth particle is its own parent. This happens in some emerging jet exotic signal as mentionned in

The proposed changes fix the crashes. I hope they make physical sense and that experts can confirm (@zmarshal do you know who else we can tag?)

If this MR is ok, we would ask it is added to a derivation release because the issue is currently preventing signal DPD production in our analysis.

Cheers, P-A

ps: also tagging @ggustavi and @emmat for their info

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