fix(TextArea): when the maximum number of words is reached, content can still be entered at a non-tail cursor

[zbw-zbw]

fix #6391

[github-actions]

PR preview has been successfully built and deployed to https://antd-mobile-preview-pr-6397.surge.sh

[zombieJ]

这个看起来不太对，maxLengthDataRef.current.isMaxLength 不应该是 onChange 里循环依赖的。从实现上看，这边只要在非输入法下裁剪就可以了。不需要记住 isMaxLength。可以参考一下这个：
https://github.com/react-component/input/blob/master/src/Input.tsx#L114

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (ed86f9a) 92.36% compared to head (3b6164e) 92.30%.
Report is 35 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6397      +/-   ##
==========================================
- Coverage   92.36%   92.30%   -0.07%     
==========================================
  Files         307      307              
  Lines        6615     6626      +11     
  Branches     1635     1635              
==========================================
+ Hits         6110     6116       +6     
- Misses        470      475       +5     
  Partials       35       35              

Files	Coverage Δ
src/components/badge/badge.tsx	100.00% <100.00%> (ø)
src/components/button/button.tsx	93.54% <ø> (-0.21%)	⬇️
src/components/text-area/text-area.tsx	94.68% <73.68%> (-5.32%)	⬇️

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