ACTS TF: Minor optimizations for stopping and extrapolation
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