WooCommerce Google Product Feeds 11.0.14

* Fix: Pass missing second argument to woocommerce_gpf_feed_item{*} filters when processing a variation product
* Fix: Product Bundle prices could be incorrect under some tax setups
* Fix: Issue where variations could send all possible attributes, not just those set on that variation
* Change: Product bundles on sale will only show current price in feed, not regular & sale
* New: Support import/export of "hide product from feed" settings
* New: Add "tested up to" headers for future WooCommerce compatibility

* Fix: Minor fix to list of Bing categories
* New: Add filter to allow short description to be used instead of full

* Change: Allow private properties on the WooCommerceGpfFeedItem object to be accessed read-only.
* Change: Pass WC_Product to woocommerce_gpf_feed_item filter
* Fix: GTIN in Bing feed was always blank
* Fix: Structured data contains incorrect SKU value
* Fix: Upgrade feed item cache bucket size to fix 'Opening and ending tag mismatch' errors with large variation output