add(behavior_path_planner): add an unittest for filterObjectsByClass function on objects_filtering.cpp

[keiota]

Description

In this PR, I create an unittest program for filterObjectsByClass function on objects_filtering.cpp.
In this unittest, there are 4 cases of tests which are divided by a object classification and filtering target type.

Tests performed

This PR will indicate new section when you do unittest

colcon test --event-handlers console_cohesion+ --packages-select behavior_path_planner

the result is below.

4: Running main() from gmock_main.cc
4: [==========] Running 2 tests from 1 test suite.
4: [----------] Global test environment set-up.
4: [----------] 2 tests from BehaviorPathPlanningObjectsFiltering
4: [ RUN      ] BehaviorPathPlanningObjectsFiltering.filterObjectsByVelocity
4: [       OK ] BehaviorPathPlanningObjectsFiltering.filterObjectsByVelocity (0 ms)
4: [ RUN      ] BehaviorPathPlanningObjectsFiltering.filterObjectsByClass
4: [       OK ] BehaviorPathPlanningObjectsFiltering.filterObjectsByClass (0 ms)
4: [----------] 2 tests from BehaviorPathPlanningObjectsFiltering (0 ms total)
4: 
4: [----------] Global test environment tear-down
4: [==========] 2 tests from 1 test suite ran. (0 ms total)
4: [  PASSED  ] 2 tests.

Effects on system behavior

Not applicable.

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[stale]

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