[Rector] Applied all Symfony 5.x rectors to the production codebase

Applied rules:
 * CommandConstantReturnCodeRector

src/lib/Command/IbexaSetupCommand.php

@@ -104,7 +104,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
             $output->writeln("\nPlatform.sh config files installed successfully");
         }
 
-        return 0;
+        return \Symfony\Component\Console\Command\Command::SUCCESS;
     }
 
     protected function getCommonFiles(string $product): Finder