test: disable non supported tests

some scripts skip the test if it's not supported for that
distro-version. Disable them in gitlab-ci.yml so we don't waste CI
resources.

To disable them, we are using the `rules` on each job with a regex
pattern. Using `=~` (pattern matches) as a  WHITELIST and `!~` (pattern
does not match) as a BLACKLIST.

test/cases/regression-composer-works-behind-satellite-fallback.sh

@@ -40,12 +40,6 @@ function generate_certificates {
 
 source /usr/libexec/osbuild-composer-test/set-env-variables.sh
 
-# Skip if running on subscribed RHEL
-if [[ "$ID" == rhel ]] && sudo subscription-manager status; then
-    echo "This test is skipped on subscribed RHEL machines."
-    exit 0
-fi
-
 # Provision the software under tet.
 /usr/libexec/osbuild-composer-test/provision.sh none
 
@@ -72,12 +66,12 @@ case "${ID}" in
                 ;;
             *)
                 echo "Unknown RHEL: ${VERSION_ID}"
-                exit 0
+                exit 1
         esac
         ;;
     *)
-        echo "unsupported distro: ${ID}-${VERSION_ID}"
-        exit 0
+        echo "$0 should be skipped on ${ID}-${VERSION_ID} check gitlab-ci.yml"
+        exit 1
 esac
 
 function cleanup {