AC-16096: [Cart] Shopping cart page is not loading when Fixed product Tax is enable

Modified getCentralSubtotal() in ensure-subtotal-sync.js to specifically select .price-excluding-tax elements when calculating row totals.
This ensures the central subtotal calculation matches the summary subtotal display, preventing the infinite refresh loop.

Author: sumesh-GL

app/code/Magento/Checkout/view/frontend/web/js/cart/ensure-subtotal-sync.js

@@ -44,7 +44,7 @@ define([
             // Sum of row totals on the table
             let sum = 0;
 
-            $root.find('#shopping-cart-table .col.subtotal .cart-price').each(function () {
+            $root.find('#shopping-cart-table .col.subtotal .price-excluding-tax .cart-price').each(function () {
                 const text = $(this).text(), val = parsePrice(text);
 
                 if (!isNaN(val)) {