Revert AWS Auth config
What does this MR do?
MR reverts https://gitlab.com/gitlab-org/quality/gitlab-environment-toolkit/-/merge_requests/318
Has subsequently been found to cause Terraform state corruption errors.
Functionality is not critical in GET - was to workaround an AWS EKS limitation in terms of user permissions, which can be done outside of GET.
Related issues
https://gitlab.com/gitlab-com/gl-infra/gitlab-dedicated/team/-/issues/250