feat: [ShoppingMerchantReviews] adds fields is_incentivized_review and is_verified_purchase to message ProductReviewAttributes (#8430)

* docs: A comment for field `custom_attributes` in message `.google.shopping.merchant.reviews.v1beta.MerchantReview` is changed
docs: A comment for field `review_language` in message `.google.shopping.merchant.reviews.v1beta.MerchantReviewAttributes` is changed
docs: A comment for field `content` in message `.google.shopping.merchant.reviews.v1beta.ProductReviewAttributes` is changed
feat: A new field `is_verified_purchase` is added to message `.google.shopping.merchant.reviews.v1beta.ProductReviewAttributes`
feat: A new field `is_incentivized_review` is added to message `.google.shopping.merchant.reviews.v1beta.ProductReviewAttributes`

PiperOrigin-RevId: 781457438

Source-Link: googleapis/googleapis@d60f969

Source-Link: googleapis/googleapis-gen@eac475d
Copy-Tag: eyJwIjoiU2hvcHBpbmdNZXJjaGFudFJldmlld3MvLk93bEJvdC55YW1sIiwiaCI6ImVhYzQ3NWQ3YzRmNmIzMTEwOWEwZDg1Zjc1NmQzYjlhYzM4MThjNTQifQ==

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: gcf-owl-bot[bot]

ShoppingMerchantReviews/metadata/V1Beta/Merchantreviews.php

@@ -27,7 +27,6 @@
 use Google\Shopping\Merchant\Reviews\V1beta\Client\MerchantReviewsServiceClient;
 use Google\Shopping\Merchant\Reviews\V1beta\InsertMerchantReviewRequest;
 use Google\Shopping\Merchant\Reviews\V1beta\MerchantReview;
-use Google\Shopping\Type\CustomAttribute;
 
 /**
  * Inserts a review for your Merchant Center account. If the review
@@ -51,10 +50,8 @@ function insert_merchant_review_sample(
     $merchantReviewsServiceClient = new MerchantReviewsServiceClient();
 
     // Prepare the request message.
-    $merchantReviewCustomAttributes = [new CustomAttribute()];
     $merchantReview = (new MerchantReview())
-        ->setMerchantReviewId($merchantReviewMerchantReviewId)
-        ->setCustomAttributes($merchantReviewCustomAttributes);
+        ->setMerchantReviewId($merchantReviewMerchantReviewId);
     $request = (new InsertMerchantReviewRequest())
         ->setParent($parent)
         ->setMerchantReview($merchantReview)

ShoppingMerchantReviews/metadata/V1Beta/MerchantreviewsCommon.php

@@ -226,8 +226,6 @@ public function insertMerchantReviewTest()
         $merchantReview = new MerchantReview();
         $merchantReviewMerchantReviewId = 'merchantReviewMerchantReviewId-1175491621';
         $merchantReview->setMerchantReviewId($merchantReviewMerchantReviewId);
-        $merchantReviewCustomAttributes = [];
-        $merchantReview->setCustomAttributes($merchantReviewCustomAttributes);
         $dataSource = 'dataSource-1333894576';
         $request = (new InsertMerchantReviewRequest())
             ->setParent($parent)
@@ -278,8 +276,6 @@ public function insertMerchantReviewExceptionTest()
         $merchantReview = new MerchantReview();
         $merchantReviewMerchantReviewId = 'merchantReviewMerchantReviewId-1175491621';
         $merchantReview->setMerchantReviewId($merchantReviewMerchantReviewId);
-        $merchantReviewCustomAttributes = [];
-        $merchantReview->setCustomAttributes($merchantReviewCustomAttributes);
         $dataSource = 'dataSource-1333894576';
         $request = (new InsertMerchantReviewRequest())
             ->setParent($parent)