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/event-dispatcher/EventSubscriberInterface.php

@@ -1,49 +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\EventDispatcher;
-
-/**
- * An EventSubscriber knows itself what events it is interested in.
- * If an EventSubscriber is added to an EventDispatcherInterface, the manager invokes
- * {@link getSubscribedEvents} and registers the subscriber as a listener for all
- * returned events.
- *
- * @author Guilherme Blanco <guilhermeblanco@hotmail.com>
- * @author Jonathan Wage <jonwage@gmail.com>
- * @author Roman Borschel <roman@code-factory.org>
- * @author Bernhard Schussek <bschussek@gmail.com>
- */
-interface EventSubscriberInterface
-{
-    /**
-     * Returns an array of event names this subscriber wants to listen to.
-     *
-     * The array keys are event names and the value can be:
-     *
-     *  * The method name to call (priority defaults to 0)
-     *  * An array composed of the method name to call and the priority
-     *  * An array of arrays composed of the method names to call and respective
-     *    priorities, or 0 if unset
-     *
-     * For instance:
-     *
-     *  * ['eventName' => 'methodName']
-     *  * ['eventName' => ['methodName', $priority]]
-     *  * ['eventName' => [['methodName1', $priority], ['methodName2']]]
-     *
-     * The code must not depend on runtime state as it will only be called at compile time.
-     * All logic depending on runtime state must be put into the individual methods handling the events.
-     *
-     * @return array<string, string|array{0: string, 1: int}|list<array{0: string, 1?: int}>>
-     */
-    public static function getSubscribedEvents();
-}