Import latest app updates from streamline

An updated set of source files and initialization was provided by streamline to
address issues observed during initial testing. These files have been updated in
order to generate a new set of app images.

docker/streamline-src/vendor/symfony/http-kernel/Event/RequestEvent.php

@@ -1,56 +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\Event;
-
-use Symfony\Component\HttpFoundation\Response;
-
-/**
- * Allows to create a response for a request.
- *
- * Call setResponse() to set the response that will be returned for the
- * current request. The propagation of this event is stopped as soon as a
- * response is set.
- *
- * @author Bernhard Schussek <bschussek@gmail.com>
- */
-class RequestEvent extends KernelEvent
-{
-    private ?Response $response = null;
-
-    /**
-     * Returns the response object.
-     */
-    public function getResponse(): ?Response
-    {
-        return $this->response;
-    }
-
-    /**
-     * Sets a response and stops event propagation.
-     *
-     * @return void
-     */
-    public function setResponse(Response $response)
-    {
-        $this->response = $response;
-
-        $this->stopPropagation();
-    }
-
-    /**
-     * Returns whether a response was set.
-     */
-    public function hasResponse(): bool
-    {
-        return null !== $this->response;
-    }
-}