minor #31994 [HttpKernel] Remove TestEventDispatcher (derrabus)

This PR was merged into the 3.4 branch.

Discussion
----------

[HttpKernel] Remove TestEventDispatcher

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | N/A
| License       | MIT
| Doc PR        | N/A

This class seems to be an orphaned test fixture. Let's delete it.

Commits
-------

48be09f37e [HttpKernel] Remove TestEventDispatcher.

src/Symfony/Component/HttpKernel/Tests/Fixtures/TestEventDispatcher.php

@@ -1,32 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\HttpKernel\Tests\Fixtures;
-
-use Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcherInterface;
-use Symfony\Component\EventDispatcher\EventDispatcher;
-
-class TestEventDispatcher extends EventDispatcher implements TraceableEventDispatcherInterface
-{
-    public function getCalledListeners()
-    {
-        return ['foo'];
-    }
-
-    public function getNotCalledListeners()
-    {
-        return ['bar'];
-    }
-
-    public function reset()
-    {
-    }
-}