Perception: fix camera location refinement ROI symmetry

[BISTU-gzy]

Summary

• fix the camera location refinement ROI trapezoid so the right boundary mirrors the left boundary
• add a regression test that checks symmetric points around the image center at the same row

Testing

• git diff --check
• bazel test --config=cpu --repo_env=PYTHON_BIN_PATH=/usr/bin/python3 --copt=-msse4.1 --host_copt=-msse4.1 //modules/perception/camera_location_refinement:location_refiner_postprocessor_test (fails in workspace fetch because local_config_cuda cannot resolve cuda_toolkit_path on this host)

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