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ITk fast LRT speed up

Thomas Strebler requested to merge tstreble/athena:ITk_Fast_LRT_speedup into 21.9

This MR brings some speed up to fast LRT exploiting:

  • generic LRT updates from !41481 (merged)
  • some early rejection of strip spaceports in strip formation (no seed lost but x2 speed-up! TBC in standard tracking at some point)
  • increase of the pT threshold to 5 GeV

Based on low-stat tests, the track finder timing for LRT is thus made equivalent to the default one run with fast tracking.

FYI @ncalace @aroepe

Edited by Thomas Strebler

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