Table 组件的标题头部为何会突然多出分割线，如何去掉

[Cyan-web]

• I have searched the issues of this repository and believe that this is not a duplicate.

What problem does this feature solve?

即使需要默认显示分割线也希望通过api关闭

What does the proposed API look like?

{ divider: boolean }

[afc163]

设计规范有更新：#30651

[xingqiwu55555]

想去掉这个分割线

[hinego]

.ant-table-thead >tr>th::before {
display: none;
}