refactor: Remove DatePicker legacy cell className

[afc163]

🤔 This is a ...

• New feature
• Bug fix
• Site / document update
• Component style update
• TypeScript definition update
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

🔗 Related issue link

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	🚮 Remove DatePicker legacy cell className for custom cell style.
🇨🇳 Chinese	🚮 移除 DatePicker 针对自定义单元格的 3.x 的兼容类名。

☑️ Self Check before Merge

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

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[codecov]

Codecov Report

Merging #21589 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #21589   +/-   ##
=======================================
  Coverage   97.86%   97.86%           
=======================================
  Files         304      304           
  Lines        7015     7015           
  Branches     1933     1898   -35     
=======================================
  Hits         6865     6865           
  Misses        150      150

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[afc163]

Gziped 后下降 0.18kb。

- 61.15KB
+ 60.97KB