fix(lane_change): skip path computation if len exceed dist to terminal start

[zulfaqar-azmi-t4]

Description

Lane change module evaluates the distance from preparation start to lane changing end at later phase.
Hence, if prepare path's lengths exceed distance to lane change terminal start, there will be unnecessary checks and computation before the evaluation.

This PR aims to fix this by skipping path computation if the prepare segment length exceed ego current distance to terminal start.

This PR also add computation.hpp/cpp to avoid utils.hpp/cpp file from having too many number of lines

After PR

[DEBUG 1722854092.480406897] [lane_change.NORMAL]: Reject: Prepare length exceed distance to terminal start. prep_len: 8.00000,  ego dist to terminal start: 7.83372 (getLaneChangePaths() at /home/zulfaqar/autoware/pilot-auto/src/autoware/universe/planning/behavior_path_planner/autoware_behavior_path_lane_change_module/src/scene.cpp:1411)
[DEBUG 1722854092.480501893] [lane_change.NORMAL]: Prepare path satisfy constraints | prep_time: 4.00000 | lon_acc sampled: 0.80000, actual: 0.80000 | prep_len: 6.40000 (operator()() at /home/zulfaqar/autoware/pilot-auto/src/autoware/universe/planning/behavior_path_planner/autoware_behavior_path_lane_change_module/src/scene.cpp:1422)

Path exceed ego dist to terminal start is being rejected.

Related links

Depends on #8358

Parent Issue:

• Link

How was this PR tested?

PSIM

Notes for reviewers

None.

Interface changes

None.

Effects on system behavior

None.

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 14 lines in your changes missing coverage. Please review.

Project coverage is 23.77%. Comparing base (389683f) to head (e1fb69c).
Report is 9 commits behind head on main.

Files	Patch %	Lines
..._path_lane_change_module/src/utils/calculation.cpp	0.00%	9 Missing ⚠️
...are_behavior_path_lane_change_module/src/scene.cpp	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8359      +/-   ##
==========================================
- Coverage   23.77%   23.77%   -0.01%     
==========================================
  Files        1379     1381       +2     
  Lines      101359   101392      +33     
  Branches    38527    38529       +2     
==========================================
+ Hits        24100    24101       +1     
- Misses      74780    74811      +31     
- Partials     2479     2480       +1     

Flag	Coverage Δ		*Carryforward flag
differential	15.67% <0.00%> (?)
total	23.78% <ø> (+<0.01%)	⬆️	Carriedforward from 389683f

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