feat(gitlab): support GitLab CI/CD component references

lib/modules/manager/gitlabci-include/extract.spec.ts

@@ -110,7 +110,7 @@ describe('modules/manager/gitlabci-include/extract', () => {
           datasource: 'gitlab-tags',
           depName: 'an-org/a-project',
           depType: 'repository',
-          skipReason: 'invalid-value',
+          registryUrls: ['https://other-gitlab.example.com'],
         },
       ]);
     });

lib/modules/manager/gitlabci-include/extract.ts

@@ -80,11 +80,12 @@ function extractDepFromIncludeComponent(
   }
   const endpointUrl = parseUrl(endpoint);
   if (endpointUrl && endpointUrl.hostname !== componentReference.fqdn) {
+    const registryUrl = `https://${componentReference.fqdn}`;
     logger.debug(
       { componentReference: includeComponent.component },
-      'Ignoring external component reference',
+      'Setting registry URL for external component reference',
     );
-    dep.skipReason = 'invalid-value';
+    dep.registryUrls = [registryUrl];
   }
   return dep;
 }