refactor(lane_change): rename lane_change_utils namespace

[zulfaqar-azmi-t4]

Description

🤖 Generated by Copilot at 8527b7e

This pull request refactors the namespace of the lane change utility functions in the behavior path planner component. The old namespace lane_change_utils is replaced by util::lane_change for clarity and consistency. The change affects several header, source, and test files that use these functions for lane change planning and checking.

Tests performed

1. Build success test
   • COMPILE_WITH_OLD_ARCHITECTURE=TRUE
   • COMPILE_WITH_OLD_ARCHITECTURE=FALSE

Pre-review checklist for the PR author

The PR author must check the checkboxes below when creating the PR.

• I've confirmed the contribution guidelines.
• The PR follows the pull request guidelines.

In-review checklist for the PR reviewers

The PR reviewers must check the checkboxes below before approval.

• The PR follows the pull request guidelines.

Post-review checklist for the PR author

The PR author must check the checkboxes below before merging.

• There are no open discussions or they are tracked via tickets.

After all checkboxes are checked, anyone who has write access can merge the PR.

[purewater0901]

Nice Again!

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (e778e73) 12.41% compared to head (8527b7e) 12.41%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3332   +/-   ##
=======================================
  Coverage   12.41%   12.41%           
=======================================
  Files        1368     1368           
  Lines       96123    96123           
  Branches    27697    27697           
=======================================
  Hits        11931    11931           
  Misses      71526    71526           
  Partials    12666    12666           

Flag	Coverage Δ		*Carryforward flag
differential	5.26% <0.00%> (?)
total	12.41% <ø> (+<0.01%)	⬆️	Carriedforward from e778e73

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

Impacted Files	Coverage Δ
...lanner/src/scene_module/avoidance_by_lc/module.cpp	0.00% <0.00%> (ø)
...ane_change/external_request_lane_change_module.cpp	0.00% <0.00%> (ø)
...rc/scene_module/lane_change/lane_change_module.cpp	0.00% <0.00%> (ø)
...ehavior_path_planner/src/util/lane_change/util.cpp	0.00% <ø> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.