[6.0] Use WebAsset for installation (joomla#45000)

* [5.3] Use WebAsset for installation
* no_unused_imports
* Already loaded due to the main template file

Author: heelc29

installation/tmpl/preinstall/default.php

@@ -9,11 +9,8 @@
 
 defined('_JEXEC') or die;
 
-use Joomla\CMS\HTML\HTMLHelper;
 use Joomla\CMS\Language\Text;
 
-HTMLHelper::_('behavior.formvalidator');
-
 /** @var \Joomla\CMS\Installation\View\Preinstall\HtmlView $this */
 ?>
 <div id="installer-view" class="container" data-page-name="preinstall">

installation/tmpl/remove/default.php

@@ -14,8 +14,6 @@
 use Joomla\CMS\Language\Text;
 use Joomla\CMS\Uri\Uri;
 
-HTMLHelper::_('behavior.formvalidator');
-
 $direction = Factory::getLanguage()->isRtl() ? 'left' : 'right';
 
 /** @var \Joomla\CMS\Installation\View\Remove\HtmlView $this */

installation/tmpl/setup/default.php

@@ -14,8 +14,6 @@
 use Joomla\CMS\HTML\HTMLHelper;
 use Joomla\CMS\Language\Text;
 
-HTMLHelper::_('behavior.formvalidator');
-
 $direction = Factory::getLanguage()->isRtl() ? 'left' : 'right';
 
 /** @var \Joomla\CMS\Installation\View\Setup\HtmlView $this */