Mute ExecutionVarsIntegrationTests.testVars (#67909)

Relates #67908

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

@@ -108,6 +108,7 @@ public class ExecutionVarsIntegrationTests extends AbstractWatcherIntegrationTes
         }
     }
 
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/67908")
     public void testVars() throws Exception {
         PutWatchResponse putWatchResponse = new PutWatchRequestBuilder(client()).setId(watchId).setSource(watchBuilder()
                 .trigger(schedule(cron("0/1 * * * * ?")))