ENGCOM-1648: Resolve Knockout non-unique elements id in console error #…

…15349

 - Merge Pull Request #15349 from neeta-wagento/magento2:feature-resolve-knockout-non-unique-id-console-error
 - Merged commits:
   1. 20d8e6a
   2. 3c8f6f4

app/code/Magento/Checkout/view/frontend/web/template/billing-address/form.html

@@ -9,7 +9,7 @@
  <!-- ko template: getTemplate() --><!-- /ko -->
  <!--/ko-->
  <form data-bind="attr: {'data-hasrequired': $t('* Required Fields')}">
- <fieldset id="billing-new-address-form" class="fieldset address">
+ <fieldset data-bind="attr: { id:'billing-new-address-form-'+index, value:index}" class="fieldset address">
  <!-- ko foreach: getRegion('additional-fieldsets') -->
  <!-- ko template: getTemplate() --><!-- /ko -->
  <!--/ko-->