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/mime/RawMessage.php

@@ -1,91 +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\Mime;
-
-use Symfony\Component\Mime\Exception\LogicException;
-
-/**
- * @author Fabien Potencier <fabien@symfony.com>
- */
-class RawMessage
-{
-    private iterable|string $message;
-    private bool $isGeneratorClosed;
-
-    public function __construct(iterable|string $message)
-    {
-        $this->message = $message;
-    }
-
-    public function toString(): string
-    {
-        if (\is_string($this->message)) {
-            return $this->message;
-        }
-
-        $message = '';
-        foreach ($this->message as $chunk) {
-            $message .= $chunk;
-        }
-
-        return $this->message = $message;
-    }
-
-    public function toIterable(): iterable
-    {
-        if ($this->isGeneratorClosed ?? false) {
-            trigger_deprecation('symfony/mime', '6.4', 'Sending an email with a closed generator is deprecated and will throw in 7.0.');
-            // throw new LogicException('Unable to send the email as its generator is already closed.');
-        }
-
-        if (\is_string($this->message)) {
-            yield $this->message;
-
-            return;
-        }
-
-        if ($this->message instanceof \Generator) {
-            $message = '';
-            foreach ($this->message as $chunk) {
-                $message .= $chunk;
-                yield $chunk;
-            }
-            $this->isGeneratorClosed = !$this->message->valid();
-            $this->message = $message;
-
-            return;
-        }
-
-        foreach ($this->message as $chunk) {
-            yield $chunk;
-        }
-    }
-
-    /**
-     * @return void
-     *
-     * @throws LogicException if the message is not valid
-     */
-    public function ensureValidity()
-    {
-    }
-
-    public function __serialize(): array
-    {
-        return [$this->toString()];
-    }
-
-    public function __unserialize(array $data): void
-    {
-        [$this->message] = $data;
-    }
-}