Ajax: Add unit tests for Site Health, auto-updates, password reset, a…

[pbearne]

…nd REST nonce handlers

• wp_ajax_health_check_dotorg_communication
• wp_ajax_health_check_background_updates
• wp_ajax_health_check_loopback_requests
• wp_ajax_health_check_site_status_result
• wp_ajax_health_check_get_sizes
• wp_ajax_toggle_auto_updates
• wp_ajax_send_password_reset
• wp_ajax_rest_nonce

This PR adds unit tests for several AJAX handlers in src/wp-admin/includes/ajax-actions.php, including Site Health checks (dotorg communication, background updates, loopback requests, result saving, and directory sizes), plugin/theme auto-update toggling, password reset emails, and REST nonce retrieval.

• Trac ticket: https://core.trac.wordpress.org/ticket/65252

• AI Disclosure:

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  • Model(s): gemini-3-flash-preview
  • Used for: Code analysis, test implementation, and environment verification.

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[github-actions]

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