fix(element): fix Checkbox.Group's change event failure

[ZhiLinLiang]

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What have you changed?

fix Checkbox.Group's change event is triggered twice, Cause functional failure.
修复多选框组选项勾选失败问题。

具体原因

Checkbox.Group组件一次点击而触发两次 change 事件并且两次chang事件获得的值不一致，所以导致切换失败。 可以参考 #3665 。

[codecov]

Codecov Report

Base: 96.57% // Head: 96.57% // No change to project coverage 👍

Coverage data is based on head (499515c) compared to base (1b809a3).
Patch has no changes to coverable lines.

Additional details and impacted files

@@              Coverage Diff              @@
##           formily_next    #3667   +/-   ##
=============================================
  Coverage         96.57%   96.57%           
=============================================
  Files               152      152           
  Lines              6603     6603           
  Branches           1836     1836           
=============================================
  Hits               6377     6377           
  Misses              226      226           

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