Add unit tests for _wp_privacy_settings_filter_draft_page_titles() in…

[pbearne]

… wp-admin/includes/misc.php
Description:
This PR adds unit tests for the _wp_privacy_settings_filter_draft_page_titles() function in wp-admin/includes/misc.php. This function is responsible for appending "(Draft)" to the titles of draft pages when they are displayed in the privacy settings dropdown, ensuring that unpublished content is clearly identified.

The tests cover:

• Successful appending of "(Draft)" to a draft page title on the privacy screen.
• Verification that published page titles remain unchanged.
• Verification that draft page titles remain unchanged when not on the privacy screen.
• Verification that other non-draft statuses (like "pending") do not trigger the title modification.

Trac ticket: https://core.trac.wordpress.org/ticket/65202

AI Disclosure:

• AI assistance: Yes
• Tool(s): Junie (JetBrains)
• Model(s): gemini-3-flash-preview
• Used for: Code analysis, test implementation, and workflow management.

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