Migrate a module from aws-sdk-go to aws-sdk-go-v2

Migrate the files whose github.com/aws/aws-sdk-go usage has a faithful aws-sdk-go-v2 form, and bring go.mod and go.sum along with them. This is a partial migration by design: v2 replaced the session, the error types, the page iterators and the waiters outright, so a file holding one of those is left as it is. go.mod and go.sum gain every module the migrated imports need, so the result builds as it stands under -mod=readonly. Then run go mod tidy: the build does not need it, but it drops what the migration leaves behind — the requirements only v1 needed, the go.sum lines nothing reads any more, and an // indirect marker on a module the source now imports directly. Run FindAwsSdkGoV1Usage to enumerate what remains.