Mute testCancelViaAsyncSearchDelete (elastic#100384)

With this commit we mute
`CrossClusterAsyncSearchIT#testCancelViaAsyncSearchDelete`.

Relates elastic#99519

x-pack/plugin/async-search/src/internalClusterTest/java/org/elasticsearch/xpack/search/CrossClusterAsyncSearchIT.java

@@ -1246,6 +1246,7 @@ public void testCancelViaTasksAPI() throws Exception {
         assertThat(json, matchesRegex(".*task (was)?\s*cancelled.*"));
     }
 
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/99519")
     public void testCancelViaAsyncSearchDelete() throws Exception {
         Map<String, Object> testClusterInfo = setupTwoClusters();
         String localIndex = (String) testClusterInfo.get("local.index");