Add CSV export for URL list

[Copilot]

Users requested the ability to export the generated URL list as a downloadable CSV file (ref: https://wordpress.org/support/topic/feature-request-csv-export/).

Changes

• New admin_init hook handler (list_all_urls_handle_csv_export): intercepts the POST before any HTML is rendered, verifies nonce + manage_options capability, fetches published posts for the selected post type, then streams urls-export.csv with a URL header column and one raw permalink per row.
• New "Export as CSV" button added to the existing admin form alongside the "Submit" button; distinguished by name="export-csv" so the export handler can identify it without a separate form or endpoint.

Raw get_permalink() values are written to the CSV (no HTML escaping), ensuring URLs are valid in the downloaded file.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/PHPCSStandards/PHPCSExtra/zipball/b598aa890815b8df16363271b659d73280129101
  • Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/PmxkQL /usr/bin/composer install --no-interaction (http block)
• https://api.github.com/repos/PHPCSStandards/PHPCSUtils/zipball/c216317e96c8b3f5932808f9b0f1f7a14e3bbf55
  • Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/PmxkQL /usr/bin/composer install --no-interaction (http block)
• https://api.github.com/repos/PHPCSStandards/PHP_CodeSniffer/zipball/0ca86845ce43291e8f5692c7356fccf3bcf02bf4
  • Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/PmxkQL /usr/bin/composer install --no-interaction (http block)
• https://api.github.com/repos/PHPCSStandards/composer-installer/zipball/845eb62303d2ca9b289ef216356568ccc075ffd1
  • Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/PmxkQL /usr/bin/composer install --no-interaction (http block)
• https://api.github.com/repos/WordPress/WordPress-Coding-Standards/zipball/7795ec6fa05663d716a549d0b44e47ffc8b0d4a6
  • Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/PmxkQL /usr/bin/composer install --no-interaction (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Ability to export URLs</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

@jonathanbossenger Vote https://wordpress.org/support/topic/feature-request-csv-export/

• Fixes Ability to export URLs #2

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