Remove `/sensors/imu` instance

[logbasem]

Need to remove /sensors/imu instance from src/sensors/src/main.rs and all references to it in this file. It is no longer needed now that we have LIDAR.

REMOVE THIS:

auto_ros2/src/sensors/src/main.rs

Lines 79 to 82 in 9f1a61d

	// create the imu publisher
	let imu_publisher: Publisher<Imu> = sensors_node
	.create_publisher("/sensors/imu", Some(qos::Profile::sensor_data()))
	.expect("create imu topic");