New pT5 r-z chi2 cut definition study based on helix approximation

[YonsiG]

The original pT5 rz chi2 cut is based on linear approximation. This PR updates the trajectory estimation as a helix, the helix does not necessarily need to start from the origin. However, it still takes the pixel information as input momentum and initial point.
After this update, the pT5 efficiency in transition region is significantly improved. While also, the fake rate is reduced.

[YonsiG]

/run standalone
/run CMSSW

[github-actions]

The PR was built and ran successfully in standalone mode. Here are some of the comparison plots.

The full set of validation and comparison plots can be found here.

Here is a timing comparison:

   Evt    Hits       MD       LS      T3       T5       pLS       pT5      pT3      TC       Reset    Event     Short             Rate
   avg     44.1    321.6    123.6     47.7     95.3    493.4    133.5    156.7    100.5      2.4    1518.7     981.2+/- 264.1     412.5   explicit_cache[s=4] (master)
   avg     44.1    323.2    123.6     48.8     96.5    501.8    119.5    161.0    100.1      2.5    1521.0     975.1+/- 259.1     416.2   explicit_cache[s=4] (this PR)

[github-actions]

The PR was built and ran successfully with CMSSW. Here are some plots.

OOTB All Tracks

The full set of validation and comparison plots can be found here.

[VourMa]

Superseded by SegmentLinking/cmssw#40