refactor(obstacle_collision_checker): move to autoware namespace

[maxime-clem]

Description

Related links

Parent Issue:

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How was this PR tested?

Notes for reviewers

None.

Interface changes

None.

Effects on system behavior

None.

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[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 26.65%. Comparing base (ef9ec8d) to head (168a0fa).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
...on_checker/src/obstacle_collision_checker_node.cpp	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9047      +/-   ##
==========================================
+ Coverage   26.62%   26.65%   +0.03%     
==========================================
  Files        1296     1301       +5     
  Lines       95702    95897     +195     
  Branches    38978    39085     +107     
==========================================
+ Hits        25476    25558      +82     
- Misses      67646    67756     +110     
- Partials     2580     2583       +3     

Flag	Coverage Δ		*Carryforward flag
differential	7.27% <33.33%> (?)
total	26.62% <ø> (ø)		Carriedforward from ef9ec8d

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