MC-22750: Update filtered methods to prevent template errors

Author: nathanjosiah

lib/internal/Magento/Framework/Filter/Template.php

@@ -80,6 +80,7 @@ class Template implements \Zend_Filter_Interface
         'vardirective',
         'delete',
         'getdatausingmethod',
+        'gettemplatefilter',
         '__destruct',
         '__call',
         '__callstatic',

lib/internal/Magento/Framework/Filter/Test/Unit/TemplateTest.php

@@ -446,7 +446,8 @@ public function disallowedMethods()
             ['getTemplateProcessor'],
             ['varDirective'],
             ['delete'],
-            ['getDataUsingMethod']
+            ['getDataUsingMethod'],
+            ['getTemplateFilter']
         ];
     }
 }