refactor(autoware_trajectory_validator): consolidate test targets

[yhisaki]

Description

Before this PR, autoware_trajectory_validator built its tests as multiple executables and kept redundant setup code in the traffic light filter test.

This PR refactors the trajectory validator test configuration.

• Consolidates the trajectory validator tests into a single test executable
• Replaces hard-coded target names in CMakeLists.txt with ${PROJECT_NAME}-based names
• Simplifies test_traffic_light_filter.cpp by removing unused node setup, redundant main, and an unused helper header

Related links

Parent Issue:

• None.

Notes for reviewers

The current diff also switches the aggregated test target to ament_auto_add_gtest(...), so reviewers should confirm that the required link dependencies for the node-oriented test remain satisfied in CI.

Interface changes

ROS Parameter Changes

Additions and removals

Change type	Parameter Name	Type	Default Value	Description
None	None	None	None	None

Modifications

Version	Parameter Name	Type	Default Value	Description
None	None	None	None	None

Topic changes

Additions and removals

Change type	Topic Type	Topic Name	Message Type	Description
None	None	None	None	None

Modifications

Version	Topic Type	Topic Name	Message Type	Description
None	None	None	None	None

Effects on system behavior

None. This change only affects test code and test build configuration.

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[maxime-clem]

Since the tests use ros2 communication they need to be added with ament_add_ros_isolated_gtest.

[yhisaki]

@maxime-clem
Thanks!
I found that the only difference between ament_auto_add_gtest and ament_add_ros_isolated_gtest is just a RUNNER.

https://github.com/ros2/ament_cmake_ros/blob/1ebf5450912a971d70638a0713a2c18b649a4d1d/ament_cmake_ros/cmake/ament_add_ros_isolated_test.cmake

So, I set RUNNER manually ad601ac.

[maxime-clem]

I had missed that line. However, I believe it is better to use ament_add_ros_isolated_gtest instead of setting the RUNNER manually.
The main reason is that in the future the way to run isolated tests may change and the macro may be updated, and this code may miss the update.

[yhisaki]

I see. At first, I wanted to use the automatic dependency resolution feature in ament_auto_xxx, but it can't be helped😢
If there's no better way, I'll revert it.