ITk fast LRT speed up

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