[composition] add launch action console output in the verify section (backport #677)

[mergify]

Noticed whenn testing osrf/ros2_test_cases#1195

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This is an automatic backport of pull request #677 done by Mergify.

[mergify]

Cherry-pick of 34d29db has failed:

On branch mergify/bp/humble/pr-677
Your branch is up to date with 'origin/humble'.

You are currently cherry-picking commit 34d29db.
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  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
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	deleted by us:   composition/README.md

no changes added to commit (use "git add" and/or "git commit -a")

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