Extend the `tools/koji-compose.py.sh` script to allow also testing the
upload to cloud, in addition to the testing that it supports currently.
If only the `DISTRO` and `ARCH` arguments are passed to the script, it
submits a new Koji compose with two image requests, as it always did.
If a `CLOUD_TARGET` and `IMAGE_TYPE` arguments are provided in addition
to `DISTRO` and `ARCH`, then the script submits a new Koji compose with
a single image request, which has the upload options set to make the
image be uploaded to cloud.
Supported cloud targets are:
- `aws`
- `azure`
- `gcp`
The image types are those that are accepted by the Cloud API. The script
does not check at all if the provided combination of the cloud target
and image type is valid and submits anything that it gets to composer.
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