Move ros2trace tests to new test_ros2trace package

[christophebedard]

Follow-up to #54 and #58

The ros2trace tests depend on the ignored test_tracetools package, so move them to a new test_ros2trace package which we will ignore as well.

[christophebedard]

Marking this as a draft until Rolling is unfrozen. Merging this now to fix buildfarm job for ros2trace

[clalancette]

This looks good to me with green CI.

For efficiency sake, I think it is enough to run CI with a build --packages-up-to ros2trace test_ros2trace and a test of --packages-select ros2trace test_ros2trace.

Note that we are explicitly going to break the Iron freeze for this, because these tests are currently causing a hang when building binary packages. With them in a separate package we can ignore them in the release repository and never try to build binary packages for them at all.

[christophebedard]

Building --packages-up-to ros2trace test_ros2trace, testing --packages-select ros2trace test_ros2trace:

• Linux
• Linux-aarch64
• Windows

[ros-discourse]

This pull request has been mentioned on ROS Discourse. There might be relevant details there:

https://discourse.ros.org/t/preparing-for-iron-branching-on-rolling-2023-04-18/30980/4