Change ssh heartbeat type to IGNORE (#15858)

dolphinscheduler-datasource-plugin/dolphinscheduler-datasource-ssh/src/main/java/org/apache/dolphinscheduler/plugin/datasource/ssh/SSHUtils.java

@@ -59,7 +59,7 @@ public class SSHUtils {
                 throw new Exception("Failed to add public key identity", e);
             }
         }
-        session.setSessionHeartbeat(SessionHeartbeatController.HeartbeatType.RESERVED, Duration.ofSeconds(3));
+        session.setSessionHeartbeat(SessionHeartbeatController.HeartbeatType.IGNORE, Duration.ofSeconds(3));
         return session;
     }
 }

dolphinscheduler-task-plugin/dolphinscheduler-task-remoteshell/src/main/java/org/apache/dolphinscheduler/plugin/task/remoteshell/RemoteExecutor.java

@@ -141,7 +141,6 @@ public class RemoteExecutor implements AutoCloseable {
             }
         }
         cleanData(taskId);
-        log.error("Remote shell task failed");
         return exitCode;
     }
 
@@ -232,8 +231,10 @@ public class RemoteExecutor implements AutoCloseable {
             channel.open();
             channel.waitFor(EnumSet.of(ClientChannelEvent.CLOSED), 0);
             channel.close();
-            if (channel.getExitStatus() != 0) {
-                throw new TaskException("Remote shell task error, error message: " + err.toString());
+            Integer exitStatus = channel.getExitStatus();
+            if (exitStatus == null || exitStatus != 0) {
+                throw new TaskException(
+                        "Remote shell task error, exitStatus: " + exitStatus + " error message: " + err);
             }
             return out.toString();
         }