fix: MultiTrajectory parameters and covariance constness

[paulgessinger]

I believe these functions were not fully usable before if used through a const MultiTrajectory.

[codecov]

Codecov Report

Merging #2009 (36dc19d) into main (ff07dd9) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2009   +/-   ##
=======================================
  Coverage   49.83%   49.83%           
=======================================
  Files         415      415           
  Lines       23593    23593           
  Branches    10681    10681           
=======================================
  Hits        11758    11758           
  Misses       4330     4330           
  Partials     7505     7505           

Impacted Files	Coverage Δ
Core/include/Acts/EventData/MultiTrajectory.hpp	70.97% <ø> (ø)
Core/include/Acts/EventData/MultiTrajectory.ipp	52.94% <ø> (ø)

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[github-actions]

📊 Physics performance monitoring for 36dc19d

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

[benjaminhuth]

looks good!