PR#3421 [1] unintentionally removed the `rhui-azure-rhel8` package from
the Azure EAP7 RHUI image base package set. As a result, the image
manifest can't be built successfully. The reason is that the removed
package installs a RPM GPG key, which is hard-coded in the image manifest
to be imported as part of the image build.
Add the package back to the image base package set and regenerate all
affected test manifests.
[1] https://github.com/osbuild/osbuild-composer/pull/3421
Signed-off-by: Tomáš Hozza <thozza@redhat.com>