feat: Add GSF component momentum cut to stabilize fit

[benjaminhuth]

Adds an optional momentum cut, which drops low weight component. This can stabilize the fit and the navigation.

Should go in after

• refactor: Some internal GSF refactorings #2697

[github-actions]

📊: Physics performance monitoring for 213347c

Full contents

physmon summary

• ✅ CKF truth_smeared
• ✅ IVF truth_smeared
• ✅ AMVF truth_smeared
• ✅ Track Summary CKF truth_smeared
• ✅ Seeding truth_estimated
• ✅ CKF truth_estimated
• ✅ IVF truth_estimated
• ✅ AMVF truth_estimated
• ✅ Track Summary CKF truth_estimated
• ✅ Seeding seeded
• ✅ CKF seeded
• ✅ IVF seeded
• ✅ AMVF seeded
• ✅ AMVF (+grid seeder) seeded
• ✅ Track Summary CKF seeded
• ✅ Seeding orthogonal
• ✅ CKF orthogonal
• ✅ IVF orthogonal
• ✅ AMVF orthogonal
• ✅ Track Summary CKF orthogonal
• ✅ Ambisolver seeded
• ✅ Ambisolver orthogonal
• ✅ Seeding ttbar
• ✅ CKF ttbar
• ✅ Ambisolver
• ✅ Track Summary CKF ttbar
• ✅ AMVF ttbar
• ✅ AMVF (+grid seeder) ttbar
• 🔴 Truth tracking (GSF)
• ✅ Truth tracking
• ✅ Particles inital fatras
• ✅ Particles final fatras
• ✅ Particles inital geant4
• ✅ Particles final geant4

[codecov]

Codecov Report

Attention: Patch coverage is 30.35714% with 39 lines in your changes missing coverage. Please review.

Project coverage is 49.63%. Comparing base (fd1e0b4) to head (213347c).
Report is 1059 commits behind head on main.

Files with missing lines	Patch %	Lines
Core/include/Acts/TrackFitting/detail/GsfActor.hpp	30.61%	15 Missing and 19 partials ⚠️
...re/include/Acts/TrackFitting/GaussianSumFitter.hpp	33.33%	0 Missing and 4 partials ⚠️
Core/include/Acts/TrackFitting/detail/GsfUtils.hpp	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2661   +/-   ##
=======================================
  Coverage   49.63%   49.63%           
=======================================
  Files         474      474           
  Lines       26941    26955   +14     
  Branches    12415    12418    +3     
=======================================
+ Hits        13372    13380    +8     
+ Misses       4746     4744    -2     
- Partials     8823     8831    +8     

☔ View full report in Codecov by Sentry.
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