[TEST] Mute WatchMetadataTests.testWatchMetadata

Due to elastic#40631

Author: droberts195

x-pack/plugin/watcher/src/test/java/org/elasticsearch/xpack/watcher/test/integration/WatchMetadataTests.java

@@ -38,6 +38,7 @@
 
 public class WatchMetadataTests extends AbstractWatcherIntegrationTestCase {
 
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/40631")
     public void testWatchMetadata() throws Exception {
         Map<String, Object> metadata = new HashMap<>();
         metadata.put("foo", "bar");