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LLP1: add unique isoDecSuffix to IsoCloseByAlgsCfg for ZPHMuons

Kehang Bai requested to merge kbai/athena:kbai-ZPHMuons-LLP1 into main

This MR fix the issue found at !78250 (comment 9201865), where when LLP1 is run together with FTAG2 (and potentially other jobs that calls the IsoCloseByAlg on standard Muons), it leads to a crash due to conflicting decorations.

The crash is because ZeroPixelHitMuons is copied from standard Muons over via a copy-constructor, so if that object was already decorated with isolation variables it will be carried over.

Therefore, when we call IsoCloseByAlg in LLP1 only with ZeroPixelHitMuons, we need a unique suffix.

tagging @tstreble, @schaffer, @spagan, @mamirono, @sagara17

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