[ECS Exec] [request]: Support real-time log streaming for ECS Exec

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Which service(s) is this request for?
ECSExec

Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?
I would like ECS Exec logs to be output in real-time. Currently, the specification is that logs are only uploaded/output after the session has ended.

Are you currently working around this issue?
No.