Breaking changes to Product Feeds API

As of Product Feeds API version 2023-07, we're introducing two breaking changes to the productfeeds webhook topics:

• Deprecated use of bulk in favour of full for the product_feeds / full_sync webhook topic.
• Corrected spelling of occurred_at field in metadata for product_feeds notifications metadata.

Partners who wish to continue receiving full sync notifications should start using the productFullSync mutation instead of productBulkSync.