The original compose request contains useful details that are not
preserved when it is converted to a manifest. Things like the
distribution, arch, image type, blueprint or customizations are useful
when examining builds later.
This saves the original request json using the job id and a new
directory (ComposeRequest) under the artifacts directory. The original
request, if present, is then added to the compose/<id>/metadata response
alongside the package list.
Related: RHEL-60120
d8e9a86921