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/var-dumper/Server/Connection.php

@@ -1,97 +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\VarDumper\Server;
-
-use Symfony\Component\VarDumper\Cloner\Data;
-use Symfony\Component\VarDumper\Dumper\ContextProvider\ContextProviderInterface;
-
-/**
- * Forwards serialized Data clones to a server.
- *
- * @author Maxime Steinhausser <maxime.steinhausser@gmail.com>
- */
-class Connection
-{
-    private string $host;
-    private array $contextProviders;
-
-    /**
-     * @var resource|null
-     */
-    private $socket;
-
-    /**
-     * @param string                     $host             The server host
-     * @param ContextProviderInterface[] $contextProviders Context providers indexed by context name
-     */
-    public function __construct(string $host, array $contextProviders = [])
-    {
-        if (!str_contains($host, '://')) {
-            $host = 'tcp://'.$host;
-        }
-
-        $this->host = $host;
-        $this->contextProviders = $contextProviders;
-    }
-
-    public function getContextProviders(): array
-    {
-        return $this->contextProviders;
-    }
-
-    public function write(Data $data): bool
-    {
-        $socketIsFresh = !$this->socket;
-        if (!$this->socket = $this->socket ?: $this->createSocket()) {
-            return false;
-        }
-
-        $context = ['timestamp' => microtime(true)];
-        foreach ($this->contextProviders as $name => $provider) {
-            $context[$name] = $provider->getContext();
-        }
-        $context = array_filter($context);
-        $encodedPayload = base64_encode(serialize([$data, $context]))."\n";
-
-        set_error_handler(static fn () => null);
-        try {
-            if (-1 !== stream_socket_sendto($this->socket, $encodedPayload)) {
-                return true;
-            }
-            if (!$socketIsFresh) {
-                stream_socket_shutdown($this->socket, \STREAM_SHUT_RDWR);
-                fclose($this->socket);
-                $this->socket = $this->createSocket();
-            }
-            if (-1 !== stream_socket_sendto($this->socket, $encodedPayload)) {
-                return true;
-            }
-        } finally {
-            restore_error_handler();
-        }
-
-        return false;
-    }
-
-    /**
-     * @return resource|null
-     */
-    private function createSocket()
-    {
-        set_error_handler(static fn () => null);
-        try {
-            return stream_socket_client($this->host, $errno, $errstr, 3) ?: null;
-        } finally {
-            restore_error_handler();
-        }
-    }
-}