[12.x] Clear parallel test view cache directories

[eduPHP]

Description

Fixes #58521

Added a directory check and deletion on view:clear

previously, parallel test directories would be left untouched

foreach ($this->files->glob("{$path}/*") as $view) {
    $this->files->delete($view);
}

added directory verification and directory deletion

foreach ($this->files->glob("{$path}/*") as $view) {
    if ($this->files->isDirectory($view)) {
        $this->files->deleteDirectory($view);
    } else {
        $this->files->delete($view);
    }
}

Test

not sure if I should test against real fixture view files then I just mocked the filesystem to go through a sample list and ensured it was calling for deleteDirectory when isDirectory returns true

./vendor/bin/phpunit --filter test_clear_view_command_should_remove_parallel_test_directories

Let me know if it needs any change