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/Test/Constraint/EmailTextBodyContains.php

@@ -1,51 +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\Test\Constraint;
-
-use PHPUnit\Framework\Constraint\Constraint;
-use Symfony\Component\Mime\Message;
-use Symfony\Component\Mime\RawMessage;
-
-final class EmailTextBodyContains extends Constraint
-{
-    private string $expectedText;
-
-    public function __construct(string $expectedText)
-    {
-        $this->expectedText = $expectedText;
-    }
-
-    public function toString(): string
-    {
-        return sprintf('contains "%s"', $this->expectedText);
-    }
-
-    /**
-     * @param RawMessage $message
-     */
-    protected function matches($message): bool
-    {
-        if (RawMessage::class === $message::class || Message::class === $message::class) {
-            throw new \LogicException('Unable to test a message text body on a RawMessage or Message instance.');
-        }
-
-        return str_contains($message->getTextBody(), $this->expectedText);
-    }
-
-    /**
-     * @param RawMessage $message
-     */
-    protected function failureDescription($message): string
-    {
-        return 'the Email text body '.$this->toString();
-    }
-}