[FLINK-14655][runtime] Change type of field jobStatusListeners from C…

…opyOnWriteArrayList to ArrayList

This closes apache#10116.

flink-runtime/src/main/java/org/apache/flink/runtime/executiongraph/ExecutionGraph.java

@@ -105,7 +105,6 @@
 import java.util.Optional;
 import java.util.concurrent.CancellationException;
 import java.util.concurrent.CompletableFuture;
-import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.Executor;
 import java.util.concurrent.Executors;
@@ -357,7 +356,7 @@ public ExecutionGraph(
 		this.verticesInCreationOrder = new ArrayList<>(16);
 		this.currentExecutions = new HashMap<>(16);
 
-		this.jobStatusListeners  = new CopyOnWriteArrayList<>();
+		this.jobStatusListeners  = new ArrayList<>();
 
 		this.stateTimestamps = new long[JobStatus.values().length];
 		this.stateTimestamps[JobStatus.CREATED.ordinal()] = System.currentTimeMillis();