feat: add the coupon_codes field to CartData to track coupon redemptions for Google Ads and Google Analytics (#33971)

* feat: add the coupon_codes field to CartData to track coupon redemptions for Google Ads and Google Analytics
feat: add the ItemCustomVariable resource to track per-item custom variables
feat: add merchant_id, merchant_feed_label, merchant_feed_language_code, conversion_value, and custom_variables fields to Item
feat: add the https://www.googleapis.com/auth/datamanager.partnerlink OAuth scope to PartnerLinkService
feat: add metadata fields to DeviceInfo to provide details about the user’s device
feat: add several new values to the ErrorReason enum to support store sales and Google Analytics validation
docs: update the description of transaction_id in Event to clarify its use for tag and SDK conversions
docs: update the description of enum value for PROCESSING_WARNING_REASON_USER_IDENTIFIER_DECRYPTION_ERROR to resolve typo
docs: update RequestStatus enum value descriptions to include details on error and warning information
docs: clarify population behavior for error_info and warning_info fields in RequestStatusPerDestination
feat: add third_party_user_data, event_location, and app_instance_id to Event
feat: add the MESSAGE value to the EventSource enum
feat: add mobile_device_id to AdIdentifiers for Google Analytics
feat: add a processing error reason related to BRAIDs and one-per-click conversions
feat: add youtube_members_count and gmail_members_count fields to the SizeInfo resource

PiperOrigin-RevId: 917255480

Source-Link: googleapis/googleapis@eb644cf

Source-Link: googleapis/googleapis-gen@4f030cc
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* 🦉 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]

google-ads-data_manager-v1/lib/google/ads/data_manager/v1/partner_link_service/credentials.rb

@@ -26,7 +26,8 @@ module PartnerLinkService
           # Credentials for the PartnerLinkService API.
           class Credentials < ::Google::Auth::Credentials
             self.scope = [
-              "https://www.googleapis.com/auth/datamanager"
+              "https://www.googleapis.com/auth/datamanager",
+              "https://www.googleapis.com/auth/datamanager.partnerlink"
             ]
             self.env_vars = [
               "GOOGLE_CLOUD_CREDENTIALS",