[WooCommerce] Moving cart calculator to the top of the cart collaterals

functions.php

<?php
/**
 * Moving cart calculator to the top of the cart collaterals
 */
add_filter( 'woocommerce_shipping_show_shipping_calculator', '__return_false' );

add_action( 'woocommerce_cart_totals_before_shipping', function(){
	$packages = WC()->shipping()->get_packages();
	$first_package = array_shift( $packages );
	$formatted_destination = WC()->countries->get_formatted_address( $first_package['destination'], ', ' );
	?>
	<tr>
		<td colspan="2">
			<p>
			<?php
				if ( $formatted_destination ) {
					// Translators: $s shipping destination.
					printf( esc_html__( 'Shipping to %s.', 'woocommerce' ) . ' ', '<strong>' . esc_html( $formatted_destination ) . '</strong>' );
					$calculator_text = esc_html__( 'Change address', 'woocommerce' );
				} else {
					echo wp_kses_post( apply_filters( 'woocommerce_shipping_estimate_html', __( 'Shipping options will be updated during checkout.', 'woocommerce' ) ) );
				}
				?>
			</p>
			<?php woocommerce_shipping_calculator(); ?>
		</td>
	</tr>
	<?php
} );