build: add ros_testing as buildtool/test_depend

[mojomex]

PR Type

• Improvement

Description

ROS 2 buildfarm is currently failing on nebula:

CMake Error at CMakeLists.txt:8 (find_package):
  By not providing "Findros_testing.cmake" in CMAKE_MODULE_PATH this project
  has asked CMake to find a package configuration file provided by
  "ros_testing", but CMake did not find one.

  Could not find a package configuration file provided by "ros_testing" with
  any of the following names:

    ros_testingConfig.cmake
    ros_testing-config.cmake

  Add the installation prefix of "ros_testing" to CMAKE_PREFIX_PATH or set
  "ros_testing_DIR" to a directory containing one of the above files.  If
  "ros_testing" provides a separate development package or SDK, be sure it
  has been installed.


-- Configuring incomplete, errors occurred!

This PR adds ros_testing as buildtool_depend for the CMake macros, and test_depend for test-time libs.

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[drwnz]

LGTM!