getUnsupportedFeatures example

'#type' => 'tableselect',
        '#header' => [
          'type' => $bundles_header,
        ],
        '#options' => $options,
        '#default_value' => $defaults,
        '#attributes' => ['class' => ['no-highlight']],
      ];
    }

    // Get unsupported features for this entity type.     $warnings = $this->moderationInformation->getUnsupportedFeatures($this->entityType);
    // Display message into the Ajax form returned.     if ($this->getRequest()->get(MainContentViewSubscriber::WRAPPER_FORMAT) == 'drupal_modal' && !empty($warnings)) {
      $form['warnings'] = ['#type' => 'status_messages', '#weight' => -1];
    }
    // Set warning message.     foreach ($warnings as $warning) {
      $this->messenger->addWarning($warning);
    }

    $form['actions'] = ['#type' => 'actions'];
    $form['actions']['submit'] = [