AWS Nodes to use IAM role instead of keys

If n8n is hosted on AWS it is sufficient, that the hosting service has a role that allows it to work with other services. It is considered best practice to prefer working with IAM roles vs. IAM users(and

Hence, all AWS nodes should have the option to choose between providing credentials and no credentials (using the internal IAM Roles).

This may be a dupe of AWS credentials chain

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