Mute FollowerFailOverIT testFailOverOnFollower (#38634)

Relates to #38633

x-pack/plugin/ccr/src/test/java/org/elasticsearch/xpack/ccr/FollowerFailOverIT.java

@@ -53,6 +53,7 @@ public class FollowerFailOverIT extends CcrIntegTestCase {
         return false;
     }
 
+    @AwaitsFix(bugUrl="https://github.com/elastic/elasticsearch/issues/38633")
     public void testFailOverOnFollower() throws Exception {
         int numberOfReplicas = between(1, 2);
         getFollowerCluster().startMasterOnlyNode();