Don't load Codeception classes

Author: brandonkelly

src/WebhookHelper.php

@@ -105,6 +105,7 @@ private static function _findClasses(): array
                         !class_exists($class, false) &&
                         !interface_exists($class, false) &&
                         file_exists($file) &&
+                        strpos($class, 'Codeception') !== 0 &&
                         substr($class, -4) !== 'Test' &&
                         substr($class, -8) !== 'TestCase'
                     ) {