Mute testDoNotWaitForPendingSeqNo

Relates #39510, #39595.

Author: DaveCTurner

server/src/test/java/org/elasticsearch/index/replication/RecoveryDuringReplicationTests.java

@@ -439,6 +439,7 @@ public void testResyncAfterPrimaryPromotion() throws Exception {
         }
     }
 
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/39510")
     public void testDoNotWaitForPendingSeqNo() throws Exception {
         IndexMetaData metaData = buildIndexMetaData(1);