Updating DisplacedSoftPion containers to be unique from LargeD0
Hi, This MR fixes an issue found in https://its.cern.ch/jira/browse/DATREP-156. The solution is to have unique ESD/TRTExtended/etc containers for the specialized "DisplacedSoftPion" tracking configuration (not run by default). Previously we were (re)using the LargeD0 containers, but this causes issues in the track finding as discovered in the above JIRA.
Cheers, Matthew