[INF-3641] Include container failure reason in error messages

[ohookins]

https://bugcrowd.atlassian.net/browse/INF-3641

https://bugcrowd.slack.com/archives/C2UJZ37HV/p1762989343701949

Addresses the problem of not having enough context on the failing container at the root of the deployment failing. Essentially just grabs the individual exit codes and failure reasons and prints them as well so we don't have to go digging in the ECS console for the developers.

Tested working:

-> Created
    Deployment created
    Step took 27 seconds to complete
-> TasksStarted
    1 Tasks have started
    Step took 0 seconds to complete
-> Live
    All tasks are live and serving requests
    Step took 20 seconds to complete
-> TasksFailed
    1 Tasks have failed

    Failure Reasons

    Task: arn:aws:ecs:us-east-1:123456789012:task/cluster/37cfd5664ae947fabf6c5f9177018471
    Reason: Essential container in task exited
      Container: app (STOPPED)
        Exit code: 137
        Reason: OutOfMemoryError: Container killed due to memory usage

[sushmithaeshwar]

Nice!