Remove command for minimal plugin standard

Because we used outdated WP coding standard we had reported errors about new WPDB placeholder %i.
[MAILPOET-6150]

mailpoet/RoboFile.php

@@ -621,9 +621,6 @@ class RoboFile extends \Robo\Tasks {
     $collection->addCode(function() {
       return $this->qaCodeSniffer([]);
     });
-    $collection->addCode(function() {
-      return $this->qaMinimalPluginStandard([]);
-    });
     return $collection->run();
   }
 
@@ -719,6 +716,7 @@ class RoboFile extends \Robo\Tasks {
       'tasks/code_sniffer/vendor',
       'tasks/phpstan/vendor',
       'tasks/makepot',
+      'tasks/minimal-plugin-standard/vendor',
       'tools/vendor',
       'tools/wpscan-semgrep-rules',
       'temp',
@@ -743,58 +741,6 @@ class RoboFile extends \Robo\Tasks {
       ->run();
   }
 
-  public function qaMinimalPluginStandard(array $filesToCheck, $opts = ['severity' => 'all']) {
-    $severityFlag = $opts['severity'] === 'all' ? '-w' : '-n';
-
-    $task = implode(' ', [
-      'php -d memory_limit=-1',
-      './tasks/code_sniffer/vendor/bin/phpcs',
-      '--parallel=' . $this->getParallelism(),
-      '--extensions=php',
-      $severityFlag,
-      '--standard=tasks/code_sniffer/vendor/wporg/plugin-directory/MinimalPluginStandard',
-      '-s',
-    ]);
-
-    $ignorePaths = [
-      '.mp_svn',
-      'assets',
-      'doc',
-      'generated',
-      'lib/Config/PopulatorData/Templates',
-      'lib-3rd-party',
-      'node_modules',
-      'plugin_repository',
-      'prefixer/build',
-      'prefixer/vendor',
-      'tasks/code_sniffer/vendor',
-      'tasks/phpstan/vendor',
-      'tasks/makepot',
-      'tools/vendor',
-      'tools/wpscan-semgrep-rules',
-      'temp',
-      'tests/_data',
-      'tests/_output',
-      'tests/_support/_generated',
-      'vendor',
-      'vendor-prefixed',
-      'views',
-    ];
-
-    // the "--ignore" arg takes a list of regexes, we need to anchor and escape them
-    $ignorePatterns = array_map(function (string $path): string {
-      return '^' . preg_quote(__DIR__ . DIRECTORY_SEPARATOR . $path);
-    }, $ignorePaths);
-
-    $stringFilesToCheck = !empty($filesToCheck) ? implode(' ', $filesToCheck) : '.';
-
-    return $this
-      ->taskExec($task)
-      ->arg('--ignore=' . implode(',', $ignorePatterns))
-      ->rawArg($stringFilesToCheck)
-      ->run();
-  }
-
   public function qaFixFile($filePath) {
     $extension = pathinfo($filePath, PATHINFO_EXTENSION);
     if ($extension === 'php') {