Mute flaky test for elastic#101876 (elastic#102404)

This failed four times in the last week. The issue to fix is elastic#101876

server/src/internalClusterTest/java/org/elasticsearch/snapshots/ConcurrentSnapshotsIT.java

@@ -1078,6 +1078,7 @@ public void testEquivalentDeletesAreDeduplicated() throws Exception {
         }
     }
 
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/101876")
     public void testMasterFailoverOnFinalizationLoop() throws Exception {
         internalCluster().startMasterOnlyNodes(3);
         final String dataNode = internalCluster().startDataOnlyNode();