Issue #3450055: Remove dedicated environments

Closes #3450055

src/Element/NextjsEnvironmentSelect.php

-<?php
-
-namespace Drupal\nextjs\Element;
-
-use Drupal\Core\Form\FormStateInterface;
-use Drupal\Core\Render\Element\Select;
-use Drupal\Core\StringTranslation\TranslatableMarkup;
-use Drupal\Core\Url;
-
-/**
- * Provides a select form element that displays available nextjs environments.
- *
- * Properties:
- * - #empty_option: The label that will be displayed to denote no selection.
- * - #empty_value: The value of the option that is used to denote no selection.
- * - #env_description: A boolean value that determines if information about
- *   environment is added to the element's description.
- *
- * @FormElement("nextjs_environment_select")
- */
-class NextjsEnvironmentSelect extends Select {
-
-  /**
-   * {@inheritdoc}
-   */
-  public function getInfo() {
-    $info = parent::getInfo();
-    $class = get_class($this);
-
-    // Add a process function.
-    array_unshift($info['#process'], [$class, 'processNextjsEnvironmentSelect']);
-
-    // Add a property for Next.js environment description.
-    $info['#env_description'] = TRUE;
-
-    // Add the 'empty' option.
-    $info['#empty_option'] = $this->t('- Select a Next.js environment -');
-
-    return $info;
-  }
-
-  /**
-   * Processes a Next.js environment select list form element.
-   *
-   * @param array $element
-   *   The form element to process.
-   * @param \Drupal\Core\Form\FormStateInterface $form_state
-   *   The current state of the form.
-   * @param array $complete_form
-   *   The complete form structure.
-   *
-   * @return array
-   *   The processed element.
-   */
-  public static function processNextjsEnvironmentSelect(array &$element, FormStateInterface $form_state, array &$complete_form) {
-    // Get the list of available environments and define the options.
-    $options = \Drupal::service('nextjs_environment.repository')->getEnvironmentNamesAsOptions();
-    $element['#options'] = $options;
-
-    // Prefix the default description with information about
-    // Next.js environments, unless disabled.
-    if ($element['#env_description']) {
-      $originalDescription = (isset($element['#description'])) ? $element['#description'] : '';
-      // @todo this causes escaping.
-      $envDescription = new TranslatableMarkup('Choose an available environment. If the desired environment is not listed, <a href=":link">create a new environment</a>.', [
-        ':link' => Url::fromRoute('entity.nextjs_environment.add_form')->toString(),
-      ]);
-      $element['#description'] = $envDescription . ' ' . $originalDescription;
-    }
-
-    return $element;
-  }
-
-}