[HUDI-2352] The upgrade downgrade action of flink writer should be singleton (#3531)

hudi-client/hudi-flink-client/src/main/java/org/apache/hudi/client/HoodieFlinkWriteClient.java

@@ -399,6 +399,17 @@ public class HoodieFlinkWriteClient<T extends HoodieRecordPayload> extends
     }
   }
 
+  /**
+   * Upgrade downgrade the Hoodie table.
+   *
+   * <p>This action should only be executed once for each commit.
+   * The modification of the table properties is not thread safe.
+   */
+  public void upgradeDowngrade(String instantTime) {
+    HoodieTableMetaClient metaClient = createMetaClient(true);
+    new FlinkUpgradeDowngrade(metaClient, config, context).run(metaClient, HoodieTableVersion.current(), config, context, instantTime);
+  }
+
   /**
    * Clean the write handles within a checkpoint interval.
    * All the handles should have been closed already.