Pandora bugfix - Shower merging algorithm - Production#908

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aliciavr wants to merge 1 commit intoproduction/sbnd-gen2from

bugfix/Production_PandoraNeutrinoSettingsShowerMergingReordering

Commits on Feb 3, 2026

Restore the shower merging algorithm in another place to avoid inconsistent state of PFParticles (-1 track scores)
aliciavr
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