Add support for building the official RHEL EC2 SAP image for RHEL-8.6.
The new image type is available under the `ec2-sap` name. Since the
image type's package set includes RHUI client RPMs, which are not
available publicly, it is by default not exposed through the Weldr API.
Extend the relevant files and definitions used for generating image test
cases. This includes addition of repository definitions needed by the
image type, specifically: `sap`, `saphana` and `ansible`.
Generate image test case for the new image type.
Add News entry for the new image type.
Signed-off-by: Tomas Hozza <thozza@redhat.com>
