chore: alias tracks in python examples

[andiwand]

after trajectories -> tracks changes we did not alias the tracks like we do it for the trajectories. therefore we relied on selectedTracks to exist which is not always the case. this PR is adding the alias

[github-actions]

📊 Physics performance monitoring for 3edaaf9

Full report
Seeding: seeded, truth estimated, orthogonal
CKF: seeded, truth smeared, truth estimated, orthogonal
IVF: seeded, truth smeared, truth estimated, orthogonal
Ambiguity resolution: seeded, orthogonal
Truth tracking
Truth tracking (GSF)

Vertexing

Vertexing vs. mu

IVF seeded

IVF truth_smeared

IVF truth_estimated

IVF orthogonal

Seeding

Seeding seeded

Seeding truth_estimated

Seeding orthogonal

CKF

CKF seeded

CKF truth_smeared

CKF truth_estimated

CKF orthogonal

Ambiguity resolution

seeded

Truth tracking (Kalman Filter)

Truth tracking

Truth tracking (GSF)

Truth tracking

[codecov]

Codecov Report

Merging #2069 (3edaaf9) into main (1f7a8f4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2069   +/-   ##
=======================================
  Coverage   49.37%   49.37%           
=======================================
  Files         427      427           
  Lines       24779    24779           
  Branches    11430    11430           
=======================================
  Hits        12234    12234           
  Misses       4484     4484           
  Partials     8061     8061           

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