fix(module: cascader): cannot use allowclear to clear the content when searching

[WhyILoveSpringRoll]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
• Demo update
• Component style update
• Bundle size optimization
• Performance optimization
• Refactoring
• Code style optimization
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🔗 Related issue link

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Fix bug that the cascade component cannot use allowclear to clear the content when searching #2607
🇨🇳 Chinese	修复Cascader组件在搜索时无法使用AllowClear清除内容的问题 #2607

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
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[github-actions]

[codecov]

Codecov Report

Merging #2610 (831d723) into master (a0fbf6b) will increase coverage by 1.79%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #2610      +/-   ##
==========================================
+ Coverage   27.79%   29.59%   +1.79%     
==========================================
  Files         497      520      +23     
  Lines       33447    25697    -7750     
  Branches        0      250     +250     
==========================================
- Hits         9298     7605    -1693     
+ Misses      24149    18052    -6097     
- Partials        0       40      +40     

Impacted Files	Coverage Δ
components/cascader/Cascader.razor.cs	21.92% <0.00%> (+4.44%)	⬆️
components/core/Helpers/MemberPath/PathNode.cs	46.15% <0.00%> (-8.85%)	⬇️
components/core/Reflection/TypeDefined.cs	77.77% <0.00%> (-7.94%)	⬇️
components/input/InputGroup.razor.cs	87.50% <0.00%> (-6.95%)	⬇️
components/timeline/Timeline.razor.cs	60.43% <0.00%> (-5.02%)	⬇️
...ponents/date-picker/types/DatePickerPlaceholder.cs	22.72% <0.00%> (-4.20%)	⬇️
...ponents/core/Component/Overlay/type/TriggerType.cs	81.25% <0.00%> (-2.97%)	⬇️
components/core/Helpers/DateHelper.cs	80.00% <0.00%> (-2.71%)	⬇️
...nts/core/Component/Overlay/OverlayTrigger.razor.cs	52.91% <0.00%> (-2.69%)	⬇️
components/core/Component/Overlay/Overlay.razor.cs	66.86% <0.00%> (-2.52%)	⬇️
... and 424 more

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