[TEST] mute the testSnapshotSucceedsAfterSnapshotFailure() test

until its clear what is going wrong.

Relates #21496

core/src/test/java/org/elasticsearch/snapshots/SharedClusterSnapshotRestoreIT.java

@@ -2672,6 +2672,7 @@ public class SharedClusterSnapshotRestoreIT extends AbstractSnapshotIntegTestCas
         assertEquals("IndexShardSnapshotFailedException[Aborted]", snapshotInfo.shardFailures().get(0).reason());
     }
 
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/21496")
     public void testSnapshotSucceedsAfterSnapshotFailure() throws Exception {
         logger.info("--> creating repository");
         final Path repoPath = randomRepoPath();