Editor: Use radio buttons for Classic Editor status

[poligilad-auto]

Summary

• Replaces the Classic Editor publish box Status <select> with a radio group while preserving the submitted post_status values.
• Updates the existing Status OK/Cancel and Private visibility behavior for the reorganized controls.
• Adds focused regression coverage for the rendered Status markup.

This is scoped to the Status control only, some Visibility UI changes are included in a seperate PR: #12298.

Trac ticket: https://core.trac.wordpress.org/ticket/65532

Testing

• LOCAL_PORT=18089 npm run test:php -- --filter Tests_Admin_IncludesMetaBoxes
• vendor/bin/phpcs --standard=phpcs.xml.dist src/wp-admin/includes/meta-boxes.php tests/phpunit/tests/admin/includesMetaBoxes.php
• npx grunt jshint:core --file=js/_enqueues/admin/post.js
• npx grunt postcss:core
• npm run build:dev
• git diff --check
• curl -I --max-time 10 http://localhost:18089

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[github-actions]

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