fix(comp:button): text and link should be user selectable

[sallerli1]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines
• Tests for the changes have been added/updated or not needed
• Docs and demo have been added/updated or not needed

What is the current behavior?

文字和链接按钮不可选中，无法复制内容

What is the new behavior?

文字和链接按钮应当按文字对待，user-select改为text

Other information

[idux-bot]

This preview will be available after the AzureCI is passed.

[codecov]

Codecov Report

Merging #1624 (5f226e5) into main (b831b6b) will not change coverage.
The diff coverage is n/a.

❗ Current head 5f226e5 differs from pull request most recent head 4f8ae79. Consider uploading reports for the commit 4f8ae79 to get more accurate results

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  Coverage   92.62%   92.62%           
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  Files         345      345           
  Lines       32160    32160           
  Branches     3672     3672           
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  Hits        29788    29788           
  Misses       2372     2372