Disable Site Health Widget and Page

<?php
if ( ! function_exists( 'scseed_remove_site_health_widget' ) ) {
    function scseed_remove_site_health_widget() {
        remove_meta_box( 'dashboard_site_health', 'dashboard', 'normal' );
    }
}
if ( ! function_exists( 'scseed_remove_site_health_menu' ) ) {
    function scseed_remove_site_health_menu() {
        remove_submenu_page( 'tools.php', 'site-health.php' );
    }
}
add_action( 'wp_dashboard_setup', 'scseed_remove_site_health_widget' );
add_action( 'admin_menu', 'scseed_remove_site_health_menu', 999 );