feat(merge_from_private): use separate param

[soblin]

Description

Declare a separate parameter for stop_line_margin of merge_from_private

Related links

https://tier4.atlassian.net/browse/RT0-28829

autowarefoundation/autoware_launch#521

Tests performed

Psim

Notes for reviewers

Interface changes

Not applicable.

Effects on system behavior

Not applicable.

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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (daa3785) 14.89% compared to head (cc3b90c) 14.89%.
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4692   +/-   ##
=======================================
  Coverage   14.89%   14.89%           
=======================================
  Files        1549     1549           
  Lines      106955   106955           
  Branches    32790    32790           
=======================================
  Hits        15927    15927           
  Misses      73635    73635           
  Partials    17393    17393           

Flag	Coverage Δ		*Carryforward flag
differential	7.10% <0.00%> (?)
total	14.89% <ø> (+<0.01%)	⬆️	Carriedforward from daa3785

*This pull request uses carry forward flags. Click here to find out more.

Files Changed	Coverage Δ
...avior_velocity_intersection_module/src/manager.cpp	19.13% <0.00%> (ø)

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