fix(diffusion planner): fix output z

[SakodaShintaro]

Description

This PR fixes the handling of Z-coordinate data in the diffusion planner by properly preserving Z-coordinates throughout the pipeline while maintaining compatibility with the neural network that expects 33-dimensional input without Z-coordinates.

Key Changes:

• Added support for Z-coordinates (Z, dZ, LB_Z, RB_Z) in lane segment data, expanding from 33 to 37 dimensions
• Implemented remove_z_coords() function to strip Z-coordinates for network input while preserving them for visualization and trajectory generation
• Updated trajectory generation to use Z-coordinates from route lanes for accurate vertical positioning

How was this PR tested?

Before

The trajectory and markers are output at a height slightly above the lanelet. They are also significantly affected by roll and pitch.

before.mp4

After

The trajectory and markers are output at the same height as the lanelet. They are hardly affected by roll or pitch.

after.mp4

Notes for reviewers

This change may cause strange behavior in environments with overpasses.

1:45~

r_reduced_x2.mp4

Interface changes

None.

Effects on system behavior

None.

[github-actions]

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[codecov]

Codecov Report

❌ Patch coverage is 13.15789% with 66 lines in your changes missing coverage. Please review.
✅ Project coverage is 17.88%. Comparing base (ce43717) to head (1bf708e).

Files with missing lines	Patch %	Lines
...oware_diffusion_planner/src/utils/marker_utils.cpp	0.00%	29 Missing ⚠️
...fusion_planner/src/preprocessing/lane_segments.cpp	0.00%	13 Missing ⚠️
...e_diffusion_planner/src/diffusion_planner_node.cpp	0.00%	12 Missing ⚠️
...lanner/src/postprocessing/postprocessing_utils.cpp	45.00%	10 Missing and 1 partial ⚠️
..._planner/src/preprocessing/preprocessing_utils.cpp	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11629      +/-   ##
==========================================
+ Coverage   17.84%   17.88%   +0.04%     
==========================================
  Files        1744     1747       +3     
  Lines      121738   122007     +269     
  Branches    42774    42836      +62     
==========================================
+ Hits        21721    21821     +100     
- Misses      81812    82107     +295     
+ Partials    18205    18079     -126     

Flag	Coverage Δ		*Carryforward flag
daily	20.02% <ø> (ø)		Carriedforward from ce43717
daily-cuda	17.82% <ø> (-0.02%)	⬇️	Carriedforward from ce43717
differential-cuda	14.52% <13.15%> (?)
total-cuda	17.82% <ø> (-0.02%)	⬇️	Carriedforward from ce43717

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

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