ENGCOM-8465: Customer Attributes Options with option group fixed #30421

 - Merge Pull Request #30421 from nitishcs6/magento2:customer-select-option-fix
 - Merged commits:
   1. b5a64c7
   2. 57a4510
   3. 9dc798f
   4. 55f6ce9
   5. d22f7f1
   6. 6eff507

Author: magento-engcom-team

app/code/Magento/Customer/Ui/Component/Listing/AttributeRepository.php

@@ -143,9 +143,13 @@ protected function getOptionArray(array $options)
     {
         /** @var \Magento\Customer\Api\Data\OptionInterface $option */
         foreach ($options as &$option) {
+            $value = $option->getValue();
+            if (is_array($option->getOptions())) {
+                $value = $this->getOptionArray($option->getOptions());
+            }
             $option = [
                 'label' => (string)$option->getLabel(),
-                'value' => $option->getValue(),
+                'value' => $value,
                 '__disableTmpl' => true
             ];
         }

dev/tests/integration/testsuite/Magento/Customer/Ui/Component/Listing/AttributeRepositoryTest.php

@@ -0,0 +1,65 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\Customer\Ui\Component\Listing;
+
+use Magento\TestFramework\Helper\Bootstrap;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Test for \Magento\Customer\Ui\Component\Listing\AttributeRepository.
+ *
+ * @magentoAppArea adminhtml
+ */
+class AttributeRepositoryTest extends TestCase
+{
+    /**
+     * @var AttributeRepository
+     */
+    private $model;
+
+    /**
+     * @inheritdoc
+     */
+    protected function setUp(): void
+    {
+        $this->model = Bootstrap::getObjectManager()->create(AttributeRepository::class);
+    }
+
+    /**
+     * Test for get store_id option array
+     *
+     * @magentoDataFixture Magento/Store/_files/core_fixturestore.php
+     * @return void
+     */
+    public function testGetOptionArray(): void
+    {
+        $result = $this->model->getMetadataByCode('store_id');
+
+        $this->assertTrue(isset($result['options']['1']['value']));
+        $this->assertEquals(
+            ['Default Store View', 'Fixture Store'],
+            $this->getStoreViewLabels($result['options'][1]['value'])
+        );
+    }
+
+    /**
+     * Returns prepared store view labels
+     *
+     * @param array $storeViewsData
+     * @return array
+     */
+    private function getStoreViewLabels(array $storeViewsData): array
+    {
+        $result = [];
+        foreach ($storeViewsData as $storeView) {
+            $result[] = str_replace("\xc2\xa0", '', $storeView['label']);
+        }
+
+        return $result;
+    }
+}