Action output does not include result of success/fail stable state

When waiting for a stable state to be reached with this action, the state that is reached is not returned as an output.
> Service arn:aws:apprunner:eu-west-2:xxxxx:service/test/xxxx....xxxxx has reached the stable state CREATE_FAILED
> App Runner step - DONE!

Perhaps there is a reason as to why a CREATE_FAILED state reached doesn't fail the overall action, but this means I can't set a `run: exit 1` / otherwise setFailed to intentionally fail the workflow when a build fails to deploy. This provides poor traceability for failed App Runner deploys.

Start at the GitHub Action's App Runner stable-state wait handling and trace how the reached state is exposed to later steps. Reproduce a deployment reaching CREATE_FAILED, then verify that the final output identifies the reached state and that workflow users can distinguish a failed deployment from a successful one.

Written by the indexing model from the issue text.