Resolve #3391309 "Bootstrap 5 remove"

Closes #3391309

src/HookHandler/PreprocessMenuLocalTask.php

+<?php
+
+declare(strict_types = 1);
+
+namespace Drupal\ui_suite_bootstrap\HookHandler;
+
+use Drupal\Core\Url;
+
+/**
+ * Prepare local task link for component.
+ */
+class PreprocessMenuLocalTask {
+
+  /**
+   * Prepare local task link for component.
+   *
+   * @param array $variables
+   *   The preprocessed variables.
+   */
+  public function preprocess(array &$variables): void {
+    $variables['link'] = $this->convertLinkElement($variables['link']);
+  }
+
+  /**
+   * Convert link element, which is not welcomed in a component template.
+   *
+   * @param array $link
+   *   The link render element to transform.
+   *
+   * @return array
+   *   An html_tag render element.
+   */
+  protected function convertLinkElement(array $link): array {
+    if (!isset($link['#type'])) {
+      return $link;
+    }
+    if ($link['#type'] !== 'link' || !($link['#url'] instanceof Url)) {
+      return $link;
+    }
+
+    /** @var array $attributes */
+    $attributes = $link['#url']->getOption('attributes') ?: [];
+    $attributes['href'] = $link['#url']->toString();
+
+    $prepared_link = [
+      '#type' => 'html_tag',
+      '#tag' => 'a',
+      '#value' => $link['#title'] ?? '',
+      '#attributes' => $attributes,
+    ];
+    return $prepared_link;
+  }
+
+}