[fix] 修复“流程类别”树形菜单构建时不支持通过setChildren()方法设置子节点的问题 · Pull Request !377 · dromara/warm-flow

1. [fix] 修复“流程类别”树形菜单构建时不支持通过setChildren()方法设置子节点的问题
---
### 更改目的 解决了什么问题(请提交到dev分支)
**问题描述：**
手动构建树形结构（通过setChildren()方法设置子节点）时，http://ip:port/warm-flow/query-def接口返回的响应体中的children属性是空的，从而导致页面的“流程类别”只显示根节点不显示子孙节点

**图片说明：**
![输入图片说明](https://foruda.gitee.com/images/1762934027979908409/13562d44_13179631.png "屏幕截图")
![输入图片说明](https://foruda.gitee.com/images/1762934036330512386/1de29b1a_13179631.png "屏幕截图")

**原因分析：**
在代码中，虽然设置了子节点，但这些子节点并没有被单独添加到trees列表中。buildTree()方法只能看到"hr"这一个节点，因为它只遍历trees列表中的元素。
![输入图片说明](https://foruda.gitee.com/images/1762934079260350019/877e4533_13179631.png "屏幕截图")
在递归列表 `recursionFn()` 方法中，调用 `getchildList()` 方法，传入的参数List<Tree> list和Tree t是相同的，这就导致分支判断条件 `StringUtils.isNotEmpty(n.getParentId()) && n.getParentId().equals(t.getId())` 结果为 `false` ，因为循环变量n就是根节点"hr"，既然是根节点就不可能有父ID，所以最终 `getchildList()` 方法返回的是一个空集合，所以调用方 `recursionFn()` 方法在往下设置children属性时也就毫无作用，从而最终导致了子孙节点的丢失

### 改动逻辑 这么写的思路(让作者更好的理解你的意图)
考虑到自己对warm-flow整体代码了解不够深入，为了降低风险，新建一个工具类 `TreeBuildUtil` ，和原有的 `TreeUtil` 类在同一个目录下，只把org.dromara.warm.flow.ui.service.WarmFlowService第105行的方法调用进行修改

### 测试 都做了哪些测试(未经过测试不采纳)
主要是三种构建节点方式的测试：所有节点平铺测试、所有节点预构建树形结构测试（通过setChildren()方法设置子节点）、混合结构测试（平铺节点+预构建树形结构）

测试结果均符合预期。

**所有节点平铺测试：**
```
List<Tree> trees = new ArrayList<>();
trees.add(new Tree("hr", "人力资源系统", null, null));
trees.add(new Tree("recruit", "招聘管理", "hr", null));
trees.add(new Tree("interview", "面试流程", "recruit", null));
trees.add(new Tree("onboard", "入职流程", "recruit", null));
trees.add(new Tree("probation", "试用期考核", "recruit", null));
trees.add(new Tree("performance", "绩效管理", "hr", null));
trees.add(new Tree("kpi", "KPI考核", "performance", null));
trees.add(new Tree("360", "360评估", "performance", null));
trees.add(new Tree("oa", "OA办公系统", null, null));
trees.add(new Tree("approval", "审批流程", "oa", null));
trees.add(new Tree("leave", "请假审批", "approval", null));
trees.add(new Tree("reimburse", "报销审批", "approval", null));
trees.add(new Tree("purchase", "采购审批", "approval", null));
```

**所有节点预构建树形结构测试：**
```
List<Tree> trees = new ArrayList<>();
trees.add(
    new Tree("hr", "人力资源系统", null, null).setChildren(
        Arrays.asList(
            new Tree("recruit", "招聘管理", "hr", null).setChildren(
                Arrays.asList(
                    new Tree("interview", "面试流程", "recruit", null),
                    new Tree("onboard", "入职流程", "recruit", null),
                    new Tree("probation", "试用期考核", "recruit", null)
                )
            ),
            new Tree("performance", "绩效管理", "hr", null).setChildren(
                Arrays.asList(
                    new Tree("kpi", "KPI考核", "performance", null),
                    new Tree("360", "360评估", "performance", null)
                )
            )
        )
    )
);
trees.add(
    new Tree("oa", "OA办公系统", null, null).setChildren(
        Arrays.asList(
            new Tree("approval", "审批流程", "oa", null).setChildren(
                Arrays.asList(
                    new Tree("leave", "请假审批", "approval", null),
                    new Tree("reimburse", "报销审批", "approval", null),
                    new Tree("purchase", "采购审批", "approval", null)
                )
            )
        )
    )
);
```

**混合结构测试（平铺节点+预构建树形结构）：**
```
List<Tree> trees = new ArrayList<>();
trees.add(new Tree("hr", "人力资源系统", null, null));
trees.add(new Tree("recruit", "招聘管理", "hr", null));
trees.add(new Tree("interview", "面试流程", "recruit", null));
trees.add(new Tree("onboard", "入职流程", "recruit", null));
trees.add(new Tree("probation", "试用期考核", "recruit", null));
trees.add(
    new Tree("performance", "绩效管理", "hr", null).setChildren(
        Arrays.asList(
            new Tree("kpi", "KPI考核", "performance", null),
            new Tree("360", "360评估", "performance", null)
        )
    )
);
trees.add(
    new Tree("oa", "OA办公系统", null, null).setChildren(
        Arrays.asList(
            new Tree("approval", "审批流程", "oa", null).setChildren(
                Arrays.asList(
                    new Tree("leave", "请假审批", "approval", null),
                    new Tree("reimburse", "报销审批", "approval", null),
                    new Tree("purchase", "采购审批", "approval", null)
                )
            )
        )
    )
);
```

类型	指派人员	状态
审查	晓华	进行中 (0/1人)
测试	晓华	进行中 (0/1人)

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