Ensure internal composer class only included once (#188)

Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>

Author: timacdonald

agent/build/agent.phar

@@ -1 +1 @@
-299B3E43194D1C173D8D265762BA9877B3E94D18B3D4133A4B48F056AFC6601497AB0BA6616897D0BCECFCFD2C46402107FB6A1F7B476F898ADF424770A874BE
+8A4301888EACC36E69F54C56E76BDFDB93BC1A35A7CC9A68204718A0A88FF903F23525344E096093FC54DDBDEB8763840CAE40886618304C3B50A51E82664ECD

agent/build/signature.txt

@@ -2,4 +2,14 @@
 
 return [
     'prefix' => 'NightwatchAgent_kden27khxA4QoEfj',
+    'patchers' => [
+        // There are situations when this file is manually required twice by Box causing a fatal PHP error.
+        static function (string $filePath, string $prefix, string $content): string {
+            if ($filePath === 'vendor/composer/InstalledVersions.php') {
+                $content = str_replace('class InstalledVersions', "\nif (! class_exists(InstalledVersions::class, autoload: false)) {\nclass InstalledVersions", $content).'}'.PHP_EOL;
+            }
+
+            return $content;
+        },
+    ],
 ];

agent/scoper.inc.php

@@ -17,7 +17,7 @@ final class Payload
      *
      * Do not modify or re-locate this constant.
      */
-    public const SIGNATURE = '299B3E4';
+    public const SIGNATURE = '8A43018';
 
     private bool $pulled = false;