fix(lane_change): prevent node from dying for trimmed shifted path

[zulfaqar-azmi-t4]

Description

getPathTurnSignal function uses shifted_path and shift_line``'s start_idxandend_idx information to generate turn signal information. However, there are possibility that the path points is deleted byPathShifter, which will result in the number of points in shifted_pathis less thanend_idx`.
To avoid behavior path planner node dead, I have added a guard.
As this is mostly happens for lane change module, we also add the guard to remove lane change candidate path when this happens.

Tests performed

Not applicable.

Effects on system behavior

Not applicable.

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[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (2aa9d1c) 14.79% compared to head (f3a22d6) 14.81%.
Report is 22 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5271      +/-   ##
==========================================
+ Coverage   14.79%   14.81%   +0.01%     
==========================================
  Files        1646     1646              
  Lines      114015   116195    +2180     
  Branches    35203    36818    +1615     
==========================================
+ Hits        16871    17209     +338     
- Misses      78146    79676    +1530     
- Partials    18998    19310     +312     

Flag	Coverage Δ		*Carryforward flag
differential	12.56% <0.00%> (?)
total	14.79% <ø> (+<0.01%)	⬆️	Carriedforward from 2aa9d1c

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

Files	Coverage Δ
...ing/behavior_path_planner/src/utils/path_utils.cpp	13.99% <0.00%> (ø)
...avior_path_planner/src/utils/lane_change/utils.cpp	0.43% <0.00%> (-0.01%)	⬇️

... and 11 files with indirect coverage changes

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