Do not show error that plugins have been disabled when they are alrea…

…dy disabled (#11803)

src/Composer/Console/Application.php

@@ -292,7 +292,7 @@ public function doRun(InputInterface $input, OutputInterface $output): int
             $this->hasPluginCommands = true;
         }
 
-        if ($isNonAllowedRoot && !$io->isInteractive()) {
+        if (!$this->disablePluginsByDefault && $isNonAllowedRoot && !$io->isInteractive()) {
             $io->writeError('<error>Composer plugins have been disabled for safety in this non-interactive session. Set COMPOSER_ALLOW_SUPERUSER=1 if you want to allow plugins to run as root/super user.</error>');
             $this->disablePluginsByDefault = true;
         }