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Draft: Improvements to Acts LRT pass

Jackson Carl Burzynskirequested to merge
jburzyns/athena:jburzyns-Acts-LRT-fixes into main

This [WIP] MR implements several fixes to recover the Legacy ITk LRT reconstruction efficiency:

  • Refits SSS seeds to improve the initial seed parameter estimate, which in turn also switches the logic of the track finding to start from the bottom SP instead of the top SP
  • Adds an option to allow the propagation to the first measurement surface in the initial track parameter estimate to fail, which was resulting in a large efficiency loss for displaced seeds

Along the way several bugs were identified in the seed refit logic that are also fixed here.

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