Test: dot-notation backward compatibility is not supported on el10

The backward compatibility layer to support also distro / repo names
without a dot is no longer supported since RHEL-10 onwards. Disable the
test case on el10.

Signed-off-by: Tomáš Hozza <thozza@redhat.com>

.gitlab-ci.yml

@@ -665,7 +665,6 @@ weldr-distro-dot-notation+aliases:
       - RUNNER:
           - aws/rhel-8.8-ga-x86_64
           - aws/rhel-9.5-nightly-x86_64
-          - aws/rhel-10.0-nightly-x86_64
         INTERNAL_NETWORK: ["true"]
 
 .generic_s3: