import-url: --version-aware does not apply to directories

[pmrowla]

    One more thing: `--version-aware` doesn't seem to do anything for directories. I would expect it to include the list of all files and the `version_id` for each inside the `.dvc` file.

If I do dvc import-url --version-aware s3://dave-sandbox-versioning/example-cloud-remote/data/, the data.dvc file looks like:

md5: 5e46b5ab89ac35532c82915752d2ddbe
frozen: true
deps:
- md5: 33ab906cdada8d288429ab9884d8e08b.dir
  size: 21
  nfiles: 3
  path: s3://dave-sandbox-versioning/example-cloud-remote/data/
outs:
- md5: 1fff39c58ffb2a046fb72f52eaff02db.dir
  size: 21
  nfiles: 3
  path: data

Originally posted by @dberenbaum in #8249 (comment)