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-foundation/Session/Flash/FlashBag.php

@@ -1,128 +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\HttpFoundation\Session\Flash;
-
-/**
- * FlashBag flash message container.
- *
- * @author Drak <drak@zikula.org>
- */
-class FlashBag implements FlashBagInterface
-{
-    private string $name = 'flashes';
-    private array $flashes = [];
-    private string $storageKey;
-
-    /**
-     * @param string $storageKey The key used to store flashes in the session
-     */
-    public function __construct(string $storageKey = '_symfony_flashes')
-    {
-        $this->storageKey = $storageKey;
-    }
-
-    public function getName(): string
-    {
-        return $this->name;
-    }
-
-    /**
-     * @return void
-     */
-    public function setName(string $name)
-    {
-        $this->name = $name;
-    }
-
-    /**
-     * @return void
-     */
-    public function initialize(array &$flashes)
-    {
-        $this->flashes = &$flashes;
-    }
-
-    /**
-     * @return void
-     */
-    public function add(string $type, mixed $message)
-    {
-        $this->flashes[$type][] = $message;
-    }
-
-    public function peek(string $type, array $default = []): array
-    {
-        return $this->has($type) ? $this->flashes[$type] : $default;
-    }
-
-    public function peekAll(): array
-    {
-        return $this->flashes;
-    }
-
-    public function get(string $type, array $default = []): array
-    {
-        if (!$this->has($type)) {
-            return $default;
-        }
-
-        $return = $this->flashes[$type];
-
-        unset($this->flashes[$type]);
-
-        return $return;
-    }
-
-    public function all(): array
-    {
-        $return = $this->peekAll();
-        $this->flashes = [];
-
-        return $return;
-    }
-
-    /**
-     * @return void
-     */
-    public function set(string $type, string|array $messages)
-    {
-        $this->flashes[$type] = (array) $messages;
-    }
-
-    /**
-     * @return void
-     */
-    public function setAll(array $messages)
-    {
-        $this->flashes = $messages;
-    }
-
-    public function has(string $type): bool
-    {
-        return \array_key_exists($type, $this->flashes) && $this->flashes[$type];
-    }
-
-    public function keys(): array
-    {
-        return array_keys($this->flashes);
-    }
-
-    public function getStorageKey(): string
-    {
-        return $this->storageKey;
-    }
-
-    public function clear(): mixed
-    {
-        return $this->all();
-    }
-}