feat(simple_object_merger): add test

[kminoda]

Description

Add pub/sub based test for simple_object_merger.

Tests performed

Not applicable.

Effects on system behavior

Not applicable.

Interface changes

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[codecov]

Codecov Report

Attention: Patch coverage is 97.18310% with 2 lines in your changes missing coverage. Please review.

Project coverage is 7.03%. Comparing base (3d849e9) to head (6dac4fb).
Report is 1654 commits behind head on main.

Files with missing lines	Patch %	Lines
...ect_merger/test/test_simple_object_merger_node.cpp	97.18%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #7637       +/-   ##
==========================================
- Coverage   15.09%   7.03%    -8.07%     
==========================================
  Files        1967      51     -1916     
  Lines      135941    2332   -133609     
  Branches    42122     191    -41931     
==========================================
- Hits        20520     164    -20356     
+ Misses      92700    2157    -90543     
+ Partials    22721      11    -22710     

Flag	Coverage Δ
differential	7.03% <97.18%> (?)
total	?

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[stale]

This pull request has been automatically marked as stale because it has not had recent activity.