Updates for ITk SD

Nicholas Stylesrequested to merge
nstyles/athena:master-regionFixes into master

A few updates:

  • Use collection name generated by CollectionMerger for ITkStrip instead of hard-coded name
  • Define ITk region for CollectionMerger to make it independent of ID configuration
  • Add correct logVol names in ITkPixelPhysicsRegionTool

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