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ACTS TF: Minor optimizations for stopping and extrapolation

Andreas Stefl requested to merge astefl/athena:acts-tf-minor-optimizations into main

These are minor optimizations for the ACTS based track finding

  • Only run the branch stopper on the first pass if we are not in reverse mode
    • This allows us to use the CKF for extrapolation so we do not have to duplicate work with a second extrapolation
  • Change extrapolation strategy to use the first track state. This is always valid since our tracks are inside-out.

Extracted these changes from !75086 (closed)

Edited by Andreas Stefl

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