fd58c98 formats the `Stage`'s `archive_path` in `Stage.archive` (as part of `web.push_to_url`). This is not needed and if the formatted differs from the original path (for example if the archive file name contains a URL query suffix), then the copy fails.
This removes the formatting that occurs in `web.push_to_url`.
We should figure out a way to handle bad cases like this *and* to have nicer filenames for downloaded files. One option that would work in this particular case would be to also pass `-J` / `--remote-header-name` to `curl`. We'll need to do follow-up work to determine if we can use `-J` everywhere.
See also: https://github.com/spack/spack/pull/11117#discussion_r338301058