MC-14937: Complete Page Builder Analytics data collection

- Add strict types topages.php

Author: davemacaulay

dev/tests/integration/testsuite/Magento/PageBuilderAnalytics/_files/pages.php

@@ -4,6 +4,8 @@
  * See COPYING.txt for license details.
  */
 
+declare(strict_types=1);
+
 // @codingStandardsIgnoreStart
 $content = <<<CONTENT
 <div data-content-type="row" data-appearance="contained" data-element="main">