Update 'Check action CLI'

[mjcarroll]

send_goal invocation needs to be updated to use the dictionary argument

ros2/kilted_tutorial_party#13

[ShahazadAbdulla]

Hi @mjcarroll (and other maintainers),

I'd like to work on this issue. As context, the problem with the ros2 action send_goal command format (order:\ 2 vs. "{order: 2}") was identified and resolved for the test description in ros2/kilted_tutorial_party#13.

For this issue (#1696) in osrf/ros2_test_cases, could you please clarify what action is needed?

1. Is there a specific test file within this repository (osrf/ros2_test_cases) that uses the incorrect ros2 action send_goal command and needs to be updated? If so, could you point me to it?
2. Or, is this issue about ensuring this finding is documented somewhere else (e.g., docs.ros.org, ros2cli documentation), or perhaps adding a new correct example test case to this repository?

Just want to make sure I'm focusing my efforts in the right place. Thanks!