Draft: Fixes for https://github.com/acts-project/acts/pull/2712

Tomasz Boldrequested to merge
tbold/athena:more-informative-trksummary-exeception into main

Subsequently added:

  • Default xAOD backend to pion particle hypo for #2712
  • Remove m_particleHypothesis from TrackStorage (unneeded after #2712)

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