Fix empty test target name in lanelet2_map_provider
$ colcon build --cmake-args "-DBUILD_TESTING=0"
If we try to compile the project while disabling testing, we face such an issue.(https://gitlab.com/autowarefoundation/autoware.auto/AutowareAuto/-/blob/master/src/mapping/had_map/lanelet2_map_provider/CMakeLists.txt#L105)