Laravel: remove property_exists check that supported Laravel versions do not require.

Author: ChrisLightfootWild

src/Instrumentation/Laravel/src/Hooks/Illuminate/Foundation/Console/ServeCommand.php

@@ -28,10 +28,6 @@ public function instrument(
             FoundationServeCommand::class,
             'handle',
             preHook: static function (FoundationServeCommand $serveCommand, array $params, string $class, string $function, ?string $filename, ?int $lineno) use ($tracer) {
-                if (!property_exists(FoundationServeCommand::class, 'passthroughVariables')) {
-                    return;
-                }
-
                 foreach ($_ENV as $key => $value) {
                     if (str_starts_with($key, 'OTEL_') && !in_array($key, FoundationServeCommand::$passthroughVariables)) {
                         FoundationServeCommand::$passthroughVariables[] = $key;