Fix: Address CI failures

- Move @phpcs:ignore for unused param above function signature.
- Add WP_Mock for admin_url() in AdminTest to fix PHPUnit error.

includes/Admin/class-admin.php

@@ -42,9 +42,8 @@ class Admin {
 	 * Enqueues admin scripts and styles.
 	 *
 	 * @param string $hook_suffix The current admin page.
-	 *
-	 * @phpcs:ignore WordPress.CodeAnalysis.UnusedFunctionParameter.Found
 	 */
+	@phpcs:ignore WordPress.CodeAnalysis.UnusedFunctionParameter.Found
 	public function enqueue_admin_assets( string $hook_suffix ) {
 		// Enqueue admin styles.
 		\wp_enqueue_style(