fix(pro:transfer): strategy parent with flat-target-data not working

[sallerli1]

PR Checklist

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• 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?

cascaderStategy ‘parent’ 在 flat-target-data 下不正常
label的count计算不正确

What is the new behavior?

修复以上问题

Other information

重构部分代码结构

[idux-bot]

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[codecov]

Codecov Report

Merging #1204 (dd043cb) into next (f13e1ce) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

❗ Current head dd043cb differs from pull request most recent head f87e135. Consider uploading reports for the commit f87e135 to get more accurate results

@@            Coverage Diff             @@
##             next    #1204      +/-   ##
==========================================
- Coverage   92.67%   92.66%   -0.02%     
==========================================
  Files         316      316              
  Lines       29028    29033       +5     
  Branches     2371     2371              
==========================================
  Hits        26903    26903              
- Misses       2125     2130       +5     

Impacted Files	Coverage Δ
packages/components/watermark/src/Watermark.tsx	27.02% <0.00%> (-1.96%)	⬇️

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