[Feedback desired] ros2/ros2_documentation tutorial on launch_testing

[abaeyens]

Hi all, the current ROS 2 documentation site has two tutorials on unit testing but none on integration testing, so I wrote a tutorial covering the basics of using launch_testing for integration testing. Here's the PR: ros2/ros2_documentation#4881.

While I've the impression I'm using launch_testing as intended, I'm not that experienced with this and I'd appreciate feedback from those more familiar with this package to ensure that the ROS 2 documentation aligns well with launch_testing best practices.

[clalancette]

I'm going to close this, as we are giving feedback on the PR.