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Bug fix to generation of links between neutral FE and muons

Mark Hodgkinson requested to merge atlas-particleflow-software/athena:mhodgkin_fixMuonLinks_March2024 into 24.0

A bug was found in the generation of these links, which was caused by an iterator in a double loop not being reset to begin().

The fix causes differences in:

JetETMissNeutralParticleFlowObjectsAuxDyn.FE_efrac_matched_muon

JetETMissNeutralParticleFlowObjectsAuxDyn.FE_nMatchedMuons

which does not lead to visible changes on MET, which is the only physics quantity currently using these links:

https://markhodgkinson.web.cern.ch/web_met_main_March18/index.html

At ESD level differences in the MET map are seen though, but these must lead to shifts which are smaller than the bin sizes in the above plots.

This MR also adds a new decoration onto charged FE, which is required for global pflow studies related to muons. This adds:

JetETMissChargedParticleFlowObjectsAuxDyn.FE_efrac_matched_muon

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