ElemeFE / ElemeFE/element

[Bug Report] el-tree懒加载功能,不支持一次性加载多级深度的子、孙节点。仅支持加载一级子节点

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Dominant language
Vue
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Description

### Element UI version
2.15.14

### OS/Browsers version
Windows11 24H2/Chrome 129.0.6668.101

### Vue version
2.7.16

### Reproduction Link
https://codepen.io/QUALIA_ZX/pen/ZEgVeON

### Steps to reproduce
点击打开懒加载的父级

### What is Expected?
load函数中resolve到的多级深度的子/孙节点可以一同加载展示

### What is actually happening?
目前仅支持加载一级,resolve中子节点的children项被全部抛弃。

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