Make error messages more detailed for exceptions thrown from Google Shipping Content service

[eason9487]

This issue carries over the enhancement made for #1725 to follow up on the remaining places that could be enhanced consistently.

Context

Previously, #1258 has pointed out the way to unify GLA error messages for ApiException errors thrown from Google Ads APIs. In Google Shopping Content library, a thrown exception instance may be Google\Exception or Google\Service\Exception. The former simply extends Exception without adding anything.

In #2007, the handler for Google\Service\Exception has been added. It also adjusted the errors that may occur when connecting to a Google Merchant Center account. #2012 followed the same direction as #2007 to adjust the error handling for site verification methods.

Classes and methods related to Google Shipping Content library

Only listing the remaining ones

src/API/Google/Merchant.php

• claimwebsite
• get_accountstatus
• has_access

src/API/Google/MerchantReport.php

• get_report_data

Technical

There is another possible enhancement related to these changes. To create an ExceptionWithResponseData, the current code snippets are repeated many times. After evaluating the feasibility of de-duplicating these code snippets, the needed changes might be done together.

Example in ApiException catcher

google-listings-and-ads/src/API/Google/AdsCampaign.php

Lines 129 to 136 in 38b94ec

	$errors = $this->get_exception_errors( $e );
	throw new ExceptionWithResponseData(
	/* translators: %s Error message */
	sprintf( __( 'Error retrieving campaigns: %s', 'google-listings-and-ads' ), reset( $errors ) ),
	$this->map_grpc_code_to_http_status_code( $e ),
	null,
	[ 'errors' => $errors ]
	);

Example in Google\Exception or Google\Service\Exception catcher

google-listings-and-ads/src/API/Google/Merchant.php

Lines 193 to 201 in 38b94ec

	$errors = $this->get_exception_errors( $e );
	throw new ExceptionWithResponseData(
	/* translators: %s Error message */
	sprintf( __( 'Unable to retrieve Merchant Center account: %s', 'google-listings-and-ads' ), reset( $errors ) ),
	$e->getCode(),
	null,
	[ 'errors' => $errors ]
	);