NPM aws-sdk

I've seen quite a few `aws` cli usage passed to github actions steps directly like that. I was wondering if it would make more sense to start using https://www.npmjs.com/package/aws-sdk and some more high level code for some of these steps or it would be too complicated.

I assume this shouldn't be done as part of this pr, but could be interesting to explore as code is easier to test than shell scripts hardcoded in yaml :)

_Originally posted by @GabLeRoux in https://github.com/game-ci/unity-builder/pull/479#discussion_r1081633696_