fix(costmap_generator): fix include for grid_map_utils

[maxime-clem]

Description

• refactor(autoware_grid_map_utils): prefix folder structure with autoware/ #9170 changed the include from autoware_grid_map_utils/... to autoware/grid_map_utils.
• perf(costmap_generator): manual blurring and fill polygons without OpenCV #9160 added includes in the old format.

So the current Autoware will not build and this PR fixes the issue.

Related links

Parent Issue:

• Link

How was this PR tested?

Notes for reviewers

None.

Interface changes

None.

Effects on system behavior

None.

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.62%. Comparing base (b6f9ef8) to head (d03a078).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9179      +/-   ##
==========================================
- Coverage   28.64%   28.62%   -0.02%     
==========================================
  Files        1314     1315       +1     
  Lines      101669   101675       +6     
  Branches    39466    39463       -3     
==========================================
- Hits        29125    29108      -17     
- Misses      69572    69759     +187     
+ Partials     2972     2808     -164     

Flag	Coverage Δ		*Carryforward flag
differential	10.38% <ø> (?)
total	28.63% <ø> (-0.02%)	⬇️	Carriedforward from b6f9ef8

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