Fix deprecation with SonataDoctrineBundle location

[jordisala1991]

Subject

I am targeting this branch, because this is BC.

This is to prevent a deprecation on the tests, but also to avoid broken builds: #6263

I think something went wrong on last release of SonataDoctrineBundle

[jordisala1991]

The problem is this file: https://github.com/sonata-project/sonata-doctrine-extensions/blob/1.x/src/Bridge/Symfony/Bundle/SonataDoctrineBundle.php

It is declaring a class named SonataDoctrineBundle, but it is also using a use of a SonataDoctrineBundle class, I think it makes everything crash.

Note that this PR is also needed to avoid deprecations, but we should resolve those errors too. (They happen on the other bridges too)

[franmomu]

I was trying to figure out want happened, could it be that in https://github.com/sonata-project/sonata-doctrine-extensions/blob/1.x/src/Bridge/Symfony/Bundle/SonataDoctrineBundle.php, is using:

use Sonata\Twig\Bridge\Symfony\SonataTwigBundle;

and then the declared class within this file is:

final class SonataTwigBundle extends Bundle

cc @phansys

[jordisala1991]

I merge this one because we don't want broken builds here, but we should take a look at it

[franmomu]

I'll make PRs, I guess adding an alias to the use is enough.