TrackParticleCellAssociationAlg: Set default PtCut to 10000 instead of overriding in config

Jackson Carl Burzynskirequested to merge
jburzyns/athena:update-cluster-assoc-defaults into master

As discussed in !59679 (merged), the PtCut property of TrackParticleCellAssociationAlg should be set to 10000 by default instead of overwritten in the top-level config.

Tagging @tstreble

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