fix(tree): enable expand when disabled

[uyarn]

🤔 这个 PR 的性质是？

• 日常 bug 修复
• 新特性提交
• 文档改进
• 演示代码改进
• 组件样式/交互改进
• CI/CD 改进
• 重构
• 代码风格优化
• 测试用例
• 分支合并
• 其他

🔗 相关 Issue

• [TreeSelect] disabled 作用在父节点 子节点需要可操作 #1458
• [TreeSelect] 如果 data 为空 v-model 赋值 如果为数字 会报错 #1450

💡 需求背景和解决方案

📝 更新日志

• fix(Tree): 父节点disable时不允许选中但允许展开

• fix(TreeSelect): 修复数字类型的value时控制台报错的异常

• chore: tree-select增加disable示例

• 本条 PR 不需要纳入 Changelog

☑️ 请求合并前的自查清单

⚠️ 请自检并全部勾选全部选项。⚠️

• 文档已补充或无须补充
• 代码演示已提供或无须提供
• TypeScript 定义已补充或无须补充
• Changelog 已提供或无须提供

[github-actions]

[codecov-commenter]

Codecov Report

Merging #1476 (06a46fe) into develop (492d477) will increase coverage by 3.70%.
The diff coverage is 80.46%.

@@             Coverage Diff             @@
##           develop    #1476      +/-   ##
===========================================
+ Coverage    57.94%   61.64%   +3.70%     
===========================================
  Files          407      643     +236     
  Lines        15371    15731     +360     
  Branches      2931     2815     -116     
===========================================
+ Hits          8907     9698     +791     
+ Misses        6187     5742     -445     
- Partials       277      291      +14     

Impacted Files	Coverage Δ
src/alert/_example/icon.vue	100.00% <ø> (ø)
src/alert/_usage/index.vue	0.00% <ø> (ø)
src/anchor/_usage/index.vue	0.00% <ø> (ø)
src/avatar/_example/base.vue	100.00% <ø> (ø)
src/avatar/_usage/index.vue	0.00% <ø> (ø)
src/badge/_usage/index.vue	0.00% <ø> (ø)
src/breadcrumb/_example/custom.vue	100.00% <ø> (ø)
src/breadcrumb/_example/dropdown.vue	100.00% <ø> (ø)
src/button/_example/icon.vue	100.00% <ø> (ø)
src/button/_usage/index.vue	0.00% <ø> (ø)
... and 458 more

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