fix(test): add clearstatcache() before class_exists in AddLangCommandTest

PHP 8.3 caches file_exists() results via realpath_cache, causing
the autoloader to not see newly created class files. clearstatcache()
forces a fresh filesystem check.

Author: Ibrahim BinAlshikh

tests/WebFiori/Framework/Tests/Cli/AddLangCommandTest.php

@@ -44,6 +44,7 @@ public function testAddLang00() {
             "1: rtl\n",
             "Success: Language added. Also, a class for the language is created at \"".APP_DIR."\Langs\" for that language.\n"
         ], $output);
+        clearstatcache();
         $this->assertTrue(class_exists('\\App\\Langs\\Lang'.$langCode));
         $this->removeClass('\\App\\Langs\\Lang'.$langCode);
         Controller::getDriver()->initialize();