Mute flaky RemoteClusterConnection test (#45850)

server/src/test/java/org/elasticsearch/transport/RemoteClusterConnectionTests.java

@@ -637,6 +637,7 @@ public class RemoteClusterConnectionTests extends ESTestCase {
         }
     }
 
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/45845")
     public void testCloseWhileConcurrentlyConnecting() throws IOException, InterruptedException, BrokenBarrierException {
         List<DiscoveryNode> knownNodes = new CopyOnWriteArrayList<>();
         try (MockTransportService seedTransport = startTransport("seed_node", knownNodes, Version.CURRENT);