Mute org.elasticsearch.xpack.restart.FullClusterRestartIT testWatcherWithApiKey {cluster=UPGRADED} elastic#119396

Author: elasticsearchmachine

muted-tests.yml

@@ -431,3 +431,6 @@ tests:
 - class: org.elasticsearch.xpack.esql.action.EsqlNodeFailureIT
   method: testFailureLoadingFields
   issue: https://github.com/elastic/elasticsearch/issues/118000
+- class: org.elasticsearch.xpack.restart.FullClusterRestartIT
+  method: testWatcherWithApiKey {cluster=UPGRADED}
+  issue: https://github.com/elastic/elasticsearch/issues/119396