Update of MuonCombined CA config for ID summary

This MR fixes the last discrepancies observed for the CA config for muons in the q445 test

Py:diff-root         INFO [CombinedMuonTrackParticlesAux.numberOfIBLOverflowsdEdx]: 1 leaves differ
Py:diff-root         INFO [CombinedMuonTrackParticlesAux.numberOfNextToInnermostPixelLayerSplitHits]: 2 leaves differ
Py:diff-root         INFO [CombinedMuonTrackParticlesAux.numberOfPixelSplitHits]: 2 leaves differ
Py:diff-root         INFO [CombinedMuonTrackParticlesAux.numberOfUsedHitsdEdx]: 1 leaves differ
Py:diff-root         INFO [CombinedMuonTrackParticlesAuxDyn.TRTdEdxUsedHits]: 1 leaves differ

In particular:

• the dEdX field are now copied in the MuonCreatorTool using the non-empty default CopyUInt8SummaryKeys FYI @goetz
• the pixel split hits are added, setting the ClusterSplitProbabilityName in a trigger-compatible way (if needed for trigger, this should be solved as part of ATR-26554)

Needed for !58389 (merged)

FYI @emoyse @elmsheus