Comments table: links within blocks of text should be underlined

[afercia]

On the WP Admin > Comments page, the 'Comment' column of the table shows the 'in reply to' line and the comments content.

Both may contain links. In such a case, the links do have surrounding text but the only means to distinguish them from normal text is color. For accessibility, the links must be cleaerly distinguished from the surrounding text:

• either they should have at least ​a 3:1 color contrast with the surrounding text (note that the color options to match this requirement are very limited)
• or they should be underlined

Discovered while testing #66015 with actual content in the Comments page.

Trac ticket: https://core.trac.wordpress.org/ticket/66257

Use of AI Tools

None

[afercia]

In 64227:

Comments: Improve the accessibility of links in the admin Comments table.

Makes sure links in the admin Comments table can be distinguished from surrounding text by restoring the native link underline.

Developed in ​https://github.com/WordPress/wordpress-develop/pull/14048

Fixes #66257.