chore(ecs): add unit test for cluster with an asg in public vpc without gateway

[nmussy]

Add a unit test to ensure that functionality for adding an autoscaling group in a public vpc without a gateway does not break in future releases.

Fixes #3641

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[piradeepk]

Thanks for adding the tests! I've added a couple comments, but overall looks good.

Pull request has been modified.

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[nmussy]

Sorry @pkandasamy91, I missed your comments. I'll look into it tomorrow 😄

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[piradeepk]

Ship it! Thanks again for taking the time to add this unit test! 👍

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