This changeset replaces `sanitize_text_field()` with `esc_url_raw()` for URLs passed via `url` and `return` query vars. This fixes an issue where the URL `example.com/หน้าภาษาไทย` would incorrectly return `example.com//` due to improper sanitization when clicking on the Customize button through the admin bar.
Props okvee, yahaly, hellofromTonya, veryard, dilip2615, amin7, swissspidy, audrasjb.
Fixes#61317.
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