[ECS] [request]: AWS ECS Execute-command return status fix

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**Tell us about your request**
What do you want us to build?

ECS Exec does not seem to pass through the exit code of command back to AWS CLI. It's not expected behaviour for most users that because SSM connected successfully then the exit code should be 0. Please add a flag like --exit-with-command-status or something similar to bubble up the error, or when the command run via ecs exec fails, exit with that status code by default.

Please refer to https://github.com/aws/amazon-ecs-agent/issues/2846 for more details.

**Which service(s) is this request for?**
This could be Fargate, ECS, EKS, ECR

Fargate/ECS

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**
What outcome are you trying to achieve, ultimately, and why is it hard/impossible to do right now? What is the impact of not having this problem solved? The more details you can provide, the better we'll be able to understand and solve the problem.

Scripts that run the "aws ecs execute-command" as a simple component are expecting the return value to match, for example the following scenario, which could just be one line in a long script:

```
> aws ecs execute-command --region us-east-1 --cluster fargate-esc-cluster --task --container ubuntu --command "ls /tmp/folderthatdoesntexist" --interactive

The Session Manager plugin was installed successfully. Use the AWS CLI to start a session.

Starting session with SessionId: ecs-execute-command-123
ls: cannot access '/tmp/folderthatdoesntexist': No such file or directory

Exiting session with sessionId: ecs-execute-command-123.

> echo $?
0
```

**Are you currently working around this issue?**
How are you currently solving this problem?

Currently we have to add some logging to our python script in ECS that prints "OUTPUT SUCCESS" then we grep for that in the response of the `aws ecs execute-command` command, which is needless to say, a hack, and doesn't work with other things like the ls example above.

**Additional context**
Anything else we should know?

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