refactor: Using UnitConstants in calculation of minHelixRadius in SpacePointGrid

[LuisFelipeCoelho]

Same as #2132

[codecov]

Codecov Report

Merging #2243 (03f510a) into main (360b24f) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #2243      +/-   ##
==========================================
- Coverage   49.35%   49.35%   -0.01%     
==========================================
  Files         445      445              
  Lines       25263    25264       +1     
  Branches    11650    11650              
==========================================
  Hits        12468    12468              
- Misses       4511     4512       +1     
  Partials     8284     8284              

Impacted Files	Coverage Δ
Core/include/Acts/Seeding/SpacePointGrid.ipp	0.00% <0.00%> (ø)

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[github-actions]

📊 Physics performance monitoring for 03f510a

Summary
Full report
Seeding: seeded, truth estimated, orthogonal
CKF: seeded, truth smeared, truth estimated, orthogonal
IVF: seeded, truth smeared, truth estimated, orthogonal
AMVF: 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

AMVF seeded

AMVF truth_smeared

AMVF truth_estimated

AMVF 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