task: #3612952 Optimize GenerateThemeTest

    parent::setUp();

    $php_executable_finder = new PhpExecutableFinder();

    $this->php = $php_executable_finder->find();

    $this->copyCodebase();

    $drupal_root = $this->getWorkingPathDrupalRoot() ?? '';

    $finder = $this->getCodebaseFinder();

    $finder->notPath([

      "#^{$drupal_root}vendor#",

      "#^{$drupal_root}core/assets#",

      "#^{$drupal_root}core/misc#",

      "#^{$drupal_root}core/phpstan-tmp#",

      "#^{$drupal_root}core/recipes#",

      "#^{$drupal_root}(.+)/tests#",

    ]);

    $this->copyCodebase($finder->getIterator());

    $this->executeCommand('COMPOSER_DISCARD_CHANGES=true composer install --no-dev --no-interaction');

    chdir($this->getWorkingPath());

    $this->starterKitInfoYamlLocation = $this->getWorkspaceDirectory() . '/core/themes/starterkit_theme/starterkit_theme.info.yml';