Remove unnecessary “Comments” column when attachment pages are disabled

[AKSHAT2802]

PR for Trac ticket: https://core.trac.wordpress.org/ticket/64201

This PR removes the “Comments” column from the Media Library when attachment pages are disabled.

When the wp_attachment_pages_enabled option is empty or evaluates to false, attachments no longer have dedicated front-end pages. In such cases, displaying the “Comments” column in the Media Library becomes redundant, since comments are not accessible or visible on attachment pages.

Benefits:

• Prevents confusion for users by hiding irrelevant UI

• Keeps the Media Library interface cleaner

• Aligns with the expected behaviour when attachment pages are disabled

[github-actions]

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Props akshat2802, westonruter, shailu25.

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[github-actions]

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[westonruter]

I'll commit this after the 6.9 branch is created for the RC1 on Tuesday.

[shail-mehta]

LGTM👍

[shail-mehta]

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