The asynciterable files are not being added to the packages

> This is the unrelated problem I was talking about; we generate these files, but haven't included them in any package. That feels like a bug. But nothing to do with your PR.

_Originally posted by @jakebailey in https://github.com/microsoft/TypeScript-DOM-lib-generator/pull/1965#discussion_r2042616216_
            