style: fix tagInput insetLabel not align with other component

[pointhalo]

中文模板 / Chinese Template

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Test Case
• TypeScript definition update
• Document improve
• CI/CD improve
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PR description

其他组件如 input、select 等支持 insetLabel的组件，在 xx-inset-label 的 classname上均会带有 font-size的声明，不会受到 body fontsize继承的影响。而tagInput表现与其他组件不一致。需要对齐。

Changelog

🇨🇳 Chinese

• Style: 修复 TagIput 在 Form 表单中使用 insetLabel时，样式与其他组件未对齐的问题
• Design Token：TagInput 增加 $color-tagInput_prefix-text-default、$spacing-tagInput_insetLabel-marginRight、$font-tagInput_insetLabel-fontWeight 三个 Token

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🇺🇸 English

• Style: fixed TagInput insetLabel style not align with other component such as Input、Select
• Design Token：TagInput add Tokens：$color-tagInput_prefix-text-default、$spacing-tagInput_insetLabel-marginRight、$font-tagInput_insetLabel-fontWeight

Checklist

• Test or no need
• Document or no need
• Changelog or no need

Other

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