planning: remove unused test config files.

modules/planning/testdata/conf/dp_poly_path_config.pb.txt

-sample_level: 8
-sample_points_num_each_level: 9
-step_length_max: 15.0
-step_length_min: 8.0
-lateral_sample_offset: 0.5
-lateral_adjust_coeff: 0.5
-eval_time_interval: 0.1
-path_resolution: 0.1

modules/planning/testdata/conf/dp_st_speed_config.pb.txt

-total_path_length: 0.1
-total_time: 3.0
-matrix_dimension_s: 100
-matrix_dimension_t: 10
-
-speed_weight: 0.0
-accel_weight: 10.0
-jerk_weight: 10.0
-obstacle_weight: 1.0
-reference_weight: 0.0
-go_down_buffer: 5.0
-go_up_buffer: 5.0
-
-st_graph_default_point_cost: 1e10
-obstacle_cost_factor: -300
-
-default_speed_cost: 1.0
-exceed_speed_penalty: 10.0
-low_speed_penalty: 2.5
-
-accel_penalty: 2.0
-decel_penalty: 2.0
-
-positive_jerk_coeff: 1.0
-negative_jerk_coeff: 300.0
-
-max_speed: 20.0
-max_acceleration: 4.5
-max_deceleration: -4.5

modules/planning/testdata/conf/qp_spline_path_config.pb.txt

-spline_order: 6
-number_of_knots: 5
-number_of_fx_constraint_knots: 13
-time_resolution: 0.1
-regularization_weight: 0.001
-derivative_weight: 1.0
-second_derivative_weight: 0.0
-third_derivative_weight: 0.5
-reference_line_weight: 0.0
-num_refline_point: 10
-num_output: 100

modules/planning/testdata/conf/qp_spline_st_speed_config_file.pb.txt

-total_path_length: 40.0
-total_time: 3.0
-output_time_resolution: 0.05
-number_of_discrete_graph_s: 80
-number_of_discrete_graph_t: 10
-number_of_evaluated_graph_t: 10
-spline_order: 6
-speed_kernel_weight: 0.0
-accel_kernel_weight: 0.0
-jerk_kernel_weight: 1000.0
-follow_weight: 0.2
-stop_weight: 1.0
-cruise_weight: 0.2
-max_speed: 20.0
-max_acceleration: 4.5
-max_deceleration: -4.5

modules/planning/testdata/conf/reference_line_smoother_config.pb.txt

-num_spline: 6
-spline_order: 6
-num_evaluated_points: 13
-boundary_bound: 0.2
-derivative_bound: 1.0
-second_derivative_bound: 1.0
-third_derivative_bound: 1.0
-ref_line_weight: 0.0
-derivative_weight: 0.0
-second_derivative_weight: 0.0
-third_derivative_weight: 100
-num_of_total_points: 500
\ No newline at end of file