Mute RemoteMigration flaky test (opensearch-project#15795)

Signed-off-by: Lakshya Taragi <[email protected]>

server/src/internalClusterTest/java/org/opensearch/remotemigration/RemoteStoreMigrationSettingsUpdateIT.java

@@ -68,6 +68,7 @@ public void testNewIndexIsRemoteStoreBackedForRemoteStoreDirectionAndMixedMode()
         assertRemoteStoreBackedIndex(indexName2);
     }
 
+    @AwaitsFix(bugUrl = "https://github.com/opensearch-project/OpenSearch/issues/15793")
     public void testNewRestoredIndexIsRemoteStoreBackedForRemoteStoreDirectionAndMixedMode() throws Exception {
         logger.info("Initialize cluster: gives non remote cluster manager");
         initializeCluster(false);