Test/add cli tests

[ielson]

Closes #357

Summary

Add tests for ros2 control CLI verbs under 'controller_manager/test', using the existing local controller_manager test setup instead of depending on ros2_control_demos.

The new tests cover CLI behavior for:

• list_controllers
• list_controller_types
• list_hardware_components
• list_hardware_interfaces
• load_controller
• reload_controller_libraries --force-kill
• reload_controller_libraries failure path without --force-kill
• set_controller_state
• switch_controllers --best-effort
• cleanup_controller
• unload_controller
• view_hardware_status

Files added:

• test_ros2_controlcli_verbs.py
• test_ros2_controlcli.yaml

Testing

• colcon test --packages-select controller_manager --ctest-args -R test_ros2_controlcli_verbs --output-on-failure
• colcon test-result --all --verbose

---

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[ielson]

PR is ready for review, from the requested checks just couldn't check if the other workflows passes, because they are awaiting approval

[bmagyar]

CI kicked off!

[ielson]

hey @bmagyar I believe that the tests didn't pass before because my branch was outdated but I have merged the new changes on it.
Can you approve the CI again?

[ielson]

@bmagyar friendly ping, can you kick the CI off again?