FIX #15736 TIME 0:20 Improve check file + test templates migration

migration/21.04/migrateTemplates.php

@@ -25,7 +25,7 @@ chdir('../..');
 $customs = scandir('custom');
 
 foreach ($customs as $custom) {
-    if ($custom == 'custom.json' || $custom == '.' || $custom == '..') {
+    if (in_array($custom, ['custom.json', 'custom.xml', '.', '..'])) {
         continue;
     }