Add the_password_form_redirect_url filter to get_the_password_form().…

[Regnalf]

Description

This PR introduces a new filter the_password_form_redirect_url in get_the_password_form() to allow developers to customize the redirect destination after a password has been entered.

Currently, this is hardcoded to the post's permalink. In scenarios like "Public Preview Links" or headless setups, the standard permalink might not be the correct return-to URL. This filter provides a clean way to modify the URL without parsing the entire HTML form.

Trac ticket: https://core.trac.wordpress.org/ticket/64785

[github-actions]

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[github-actions]

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[github-actions]

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