ENGCOM-2068: Refactor validate code in Tax module #16270

 - Merge Pull Request #16270 from vgelani/magento2:2.1-develop-backport-2-15343
 - Merged commits:
   1. 67a9e13

Author: magento-engcom-team

app/code/Magento/Tax/view/adminhtml/templates/class/page/edit.phtml

@@ -11,10 +11,10 @@
     <?php echo $block->getSaveButtonHtml(); ?>
 </div>
 <?php echo $block->getRenameFormHtml(); ?>
-<script>
-require(['jquery', "mage/mage"], function(jQuery){
-
-    jQuery('#<?php /* @escapeNotVerified */ echo $block->getRenameFormId() ?>').mage('form').mage('validation');
-
-});
-</script>
+<script type="text/x-magento-init">
+    {
+        "#<?= /* @escapeNotVerified */ $block->getRenameFormId() ?>": {
+            "Magento_Tax/js/page/validate": {}
+        }
+    }
+</script>

app/code/Magento/Tax/view/adminhtml/web/js/validate.js

@@ -0,0 +1,15 @@
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+define([
+    'jquery',
+    'mage/mage'
+], function (jQuery) {
+    'use strict';
+
+    return function (data, element) {
+        jQuery(element).mage('form').mage('validation');
+    };
+});