Related to https://gitlab.com/gitlab-org/gitlab/-/issues/334160

Main motivations are:

- This tool is developed by AWS and is their standard interacting with
  their API from the command line
- Better credential handling, including support for IMDSv2. This means
  that a container running on an EC2 instance can automatically use IAM
  roles and permissions associated with the instance. And when running
  in Kubernetes (like in EKS) a native OIDC implementation will allow a
  pod to receive a specific role when using a service account annotated
  with the right role. This 'just works' without having to maintain a
  specific set of credentials.
  See: https://aws.amazon.com/blogs/opensource/introducing-fine-grained-iam-roles-service-accounts/
  Lastly, credentials could just be passed in via environment variables,
  which also 'just works' with the CLI.