feat：添加流程审批时校验，是否为下一个流程审批的节点

yudao-module-bpm/yudao-module-bpm-api/src/main/java/cn/iocoder/yudao/module/bpm/enums/ErrorCodeConstants.java

@@ -57,6 +57,7 @@ public interface ErrorCodeConstants {
     ErrorCode TASK_CREATE_FAIL_NO_CANDIDATE_USER = new ErrorCode(1_009_006_003, "操作失败，原因：找不到任务的审批人！");
     ErrorCode TASK_SIGNATURE_NOT_EXISTS = new ErrorCode(1_009_005_015, "签名不能为空！");
     ErrorCode TASK_REASON_REQUIRE = new ErrorCode(1_009_005_016, "审批意见不能为空！");
+    ErrorCode TASK_START_USER_SELECT_NODE_NOT_EXISTS = new ErrorCode(1_009_004_007, "({})不是下一个执行的流程节点！");
 
     // ========== 动态表单模块 1-009-010-000 ==========
     ErrorCode FORM_NOT_EXISTS = new ErrorCode(1_009_010_000, "动态表单不存在");