Option to ignore "fluff" when using the `--cmd` flag about ecsgo HOT 2 CLOSED

@hsommerlandreason added a --quiet flag in v0.5.0, this is probably the best we can do until aws/session-manager-plugin#85 is addressed.

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I think the best I can do is remove the first few lines i.e.

Cluster: xxxxxx | Service:  | Task: xxxxxxxxxxxx | Cmd: echo "hello"
Connecting to container xxxxxxxxxxxxx

Since the remaining Starting session with SessionId... is printed from the session-manager-plugin. It might be troublesome to remove that text. It looks like there is an open issue for this on the session-manager-plugin repo though.

Would you be happy for me to add a -q flag to disable the aforementioned lines? Something like

ecsgo -q -n test-ecsgo -t  584c7724322e4d41a4d560523aacc745 -u nginx -c 'echo hello'

Starting session with SessionId: ecs-execute-command-0eb8eff6298eef532
hello


Exiting session with sessionId: ecs-execute-command-0eb8eff6298eef532.

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