Mute TimeSeriesLifecycleActionsIT.waitForSnapshot (#51208)

This test was recently un-muted, but is still failing

Relates: #50781
Backport of: #51203

x-pack/plugin/ilm/qa/multi-node/src/test/java/org/elasticsearch/xpack/ilm/TimeSeriesLifecycleActionsIT.java

@@ -324,6 +324,7 @@ public class TimeSeriesLifecycleActionsIT extends ESRestTestCase {
         });
     }
 
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/50781")
     public void testWaitForSnapshot() throws Exception {
         createIndexWithSettings(index, Settings.builder().put(IndexMetaData.SETTING_NUMBER_OF_SHARDS, 1)
             .put(IndexMetaData.SETTING_NUMBER_OF_REPLICAS, 0));