chore: fix cspell errors and enable spell-check in planning directories

[HansRobo]

Description

• fix all cspell errors in planning directories
• enable spell-check-partial for planning directories

Tests performed

• build test by GithHub Actions
• spell-check-partial by GitHub Actions

Effects on system behavior

None

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.22% ⚠️

Comparison is base (cf42588) 15.10% compared to head (92df8db) 14.88%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4716      +/-   ##
==========================================
- Coverage   15.10%   14.88%   -0.22%     
==========================================
  Files        1563     1548      -15     
  Lines      107888   106848    -1040     
  Branches    33101    32762     -339     
==========================================
- Hits        16300    15908     -392     
+ Misses      73819    73555     -264     
+ Partials    17769    17385     -384     

Flag	Coverage Δ		*Carryforward flag
differential	10.73% <0.00%> (?)
total	14.90% <ø> (-0.21%)	⬇️	Carriedforward from 5688b61

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

Files Changed	Coverage Δ
...ity_intersection_module/src/scene_intersection.cpp	0.00% <ø> (ø)
...ity_intersection_module/src/scene_intersection.hpp	0.00% <ø> (ø)
...behavior_velocity_intersection_module/src/util.cpp	0.00% <0.00%> (ø)
...ior_velocity_intersection_module/src/util_type.hpp	0.00% <0.00%> (ø)
...k_constrained_smoother/velocity_planning_utils.cpp	0.00% <0.00%> (ø)
...e_planner/include/obstacle_cruise_planner/node.hpp	11.11% <ø> (ø)

... and 49 files with indirect coverage changes

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[HansRobo]

@TakaHoribe @rej55 @mkuri
Could you review as code owners of motion_velocity_smoother?

[rej55]

@HansRobo Sorry for late review. Thank you for fix!