[AutoImport][PostRector] Handle duplicated import on namespaced class on UseAddingPostRector

[samsonasik]

Continue of PR:

• [Renaming] Keep unused import unless configured $rectorConfig->removeUnusedImports() on RenameClassRector on no namespace #3460

When auto import is namespaced, the old classname should be cleaned up before add to avoid duplicated import.

Given the following config:

<?php

declare(strict_types=1);

use Rector\Config\RectorConfig;
use Rector\Symfony\Rector\ClassMethod\ReplaceSensioRouteAnnotationWithSymfonyRector;

return static function (RectorConfig $rectorConfig): void {
    $rectorConfig->importNames();
    $rectorConfig->rule(ReplaceSensioRouteAnnotationWithSymfonyRector::class);
};

with class:

<?php

namespace App;

use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;

/**
 * @Route("/someUrl")
 */
class SomeController extends Controller
{
}

It currently produce duplicated use statement.

 namespace App;
 
+use Symfony\Component\Routing\Annotation\Route;
 use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
 use Symfony\Bundle\FrameworkBundle\Controller\Controller;

This PR try to fix it.

[samsonasik]

All checks have passed 🎉 @TomasVotruba I think it is ready.

[samsonasik]

@TomasVotruba I am merging it ;)