fix(comp:select): the onSearch should be called when the intput is clear

[danranVm]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines
• Tests for the changes have been added/updated or not needed
• Docs and demo have been added/updated or not needed

What is the current behavior?

• 设置 searchable = true 时，点击输入框的清除图标，不会触发 onSearch 事件，仅触发 onClear 事件
• 设置 searchable = ’overlay‘ 时，点击浮层中输入框的清除图标，不会触发任何事件

What is the new behavior?

• 现在都会触发 onSearch 事件，参数为 '' 空字符。
• 受影响的组件有：Cascader， Select, TreeSelect

Other information

[idux-bot]

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[codecov]

Codecov Report

Merging #1577 (ad7f462) into main (feb5a33) will decrease coverage by 0.02%.
The diff coverage is 30.00%.

❗ Current head ad7f462 differs from pull request most recent head d6fdd9b. Consider uploading reports for the commit d6fdd9b to get more accurate results

@@            Coverage Diff             @@
##             main    #1577      +/-   ##
==========================================
- Coverage   92.77%   92.75%   -0.02%     
==========================================
  Files         332      332              
  Lines       30692    30695       +3     
  Branches     3509     3509              
==========================================
- Hits        28475    28472       -3     
- Misses       2217     2223       +6     

Impacted Files	Coverage Δ
packages/components/select/src/Select.tsx	85.43% <0.00%> (-1.03%)	⬇️
packages/components/cascader/src/Cascader.tsx	83.87% <25.00%> (-1.18%)	⬇️
packages/components/notification/src/types.ts	100.00% <100.00%> (ø)