Skip upgrade assistant test until fixture is updated (#30587)

The test's setup routine loads a data directory into ES that is not
compatible with version 8.0.0, so ES fails to start and the test always
fails.

It is skipped for now to unblock CI, but this should be resolved for 8.0

x-pack/scripts/functional_tests.js

@@ -18,5 +18,6 @@ require('@kbn/test').runTestsCli([
   require.resolve('../test/saved_object_api_integration/security_and_spaces/config'),
   require.resolve('../test/saved_object_api_integration/security_only/config'),
   require.resolve('../test/saved_object_api_integration/spaces_only/config'),
-  require.resolve('../test/upgrade_assistant_integration/config'),
+  // todo: re-enable when https://github.com/elastic/kibana/issues/30586 is fixed
+  //require.resolve('../test/upgrade_assistant_integration/config'),
 ]);