feat(custom-resources): allow specifying role for AwsCustomResource

[jogold]

Also removed useless console.log outputs from tests

Closes #4906

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[eladb]

The function is implementing the "custom resource provider". It's an important distinction because it's a singleton, so the role will apply to all AwsCustomResource instances in your app. Probably fine, but worth documenting.

Pull request has been modified.

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