Explicitly configure max tracking in test

Author: nicktindall

server/src/test/java/org/elasticsearch/cluster/routing/allocation/allocator/DesiredBalanceReconcilerTests.java

@@ -1455,6 +1455,7 @@ public Decision canAllocate(ShardRouting shardRouting, RoutingNode node, Routing
         final var clusterSettings = createBuiltInClusterSettings(
             Settings.builder()
                 .put(UndesiredAllocationsTracker.UNDESIRED_ALLOCATION_DURATION_LOG_THRESHOLD_SETTING.getKey(), undesiredAllocationThreshold)
+                .put(UndesiredAllocationsTracker.MAX_UNDESIRED_ALLOCATIONS_TO_TRACK.getKey(), 10)
                 .build()
         );
         final var timeProvider = new AdvancingTimeProvider();