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/Header/UnstructuredHeader.php

@@ -1,70 +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\Header;
-
-/**
- * A Simple MIME Header.
- *
- * @author Chris Corbyn
- */
-class UnstructuredHeader extends AbstractHeader
-{
-    private string $value;
-
-    public function __construct(string $name, string $value)
-    {
-        parent::__construct($name);
-
-        $this->setValue($value);
-    }
-
-    /**
-     * @param string $body
-     *
-     * @return void
-     */
-    public function setBody(mixed $body)
-    {
-        $this->setValue($body);
-    }
-
-    public function getBody(): string
-    {
-        return $this->getValue();
-    }
-
-    /**
-     * Get the (unencoded) value of this header.
-     */
-    public function getValue(): string
-    {
-        return $this->value;
-    }
-
-    /**
-     * Set the (unencoded) value of this header.
-     *
-     * @return void
-     */
-    public function setValue(string $value)
-    {
-        $this->value = $value;
-    }
-
-    /**
-     * Get the value of this header prepared for rendering.
-     */
-    public function getBodyAsString(): string
-    {
-        return $this->encodeWords($this, $this->value);
-    }
-}