feat(crosswalk): add velocity factor when slowing down

[maxime-clem]

Description

add velocity factor when slowing down in the crosswalk module.

Tests performed

Not applicable.

Effects on system behavior

Not applicable.

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 14.78%. Comparing base (872cbdd) to head (bdd4bd9).
Report is 4 commits behind head on main.

Files	Patch %	Lines
..._velocity_crosswalk_module/src/scene_crosswalk.cpp	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6670      +/-   ##
==========================================
- Coverage   14.78%   14.78%   -0.01%     
==========================================
  Files        1925     1925              
  Lines      132734   132740       +6     
  Branches    39529    39533       +4     
==========================================
  Hits        19625    19625              
- Misses      91137    91143       +6     
  Partials    21972    21972              

Flag	Coverage Δ		*Carryforward flag
differential	11.10% <0.00%> (?)
total	14.78% <ø> (ø)		Carriedforward from 872cbdd

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