* Remove template matching from front-end
* Create 'woocommerce_rest_get_product' filter to allow extensions to change the product when it's fetched through the REST API
* Stop defaulting to 'standard-product-template' product template and handle defaults only in getLayoutTemplateId function
* Use created hook to determine and persist the product template ID when it's not defined.
Also introduce 'match_fn' in ProductTemplate to allow extensions to provide robust ways of matching the template
* Add changelog
* Fix tests
* Remove outdated tests
* Fix issue in filter because $product can be false and move API change to v3
* Add comments to continue statements
* Small refactor
* Only send layout template id to useLayoutTemplate after product is loaded
* Revert front-end changes
* Remove match_fn and create filter to allow extensions to determine the product template id
* Avoid loading layout template before product is loaded
* Create woocommerce_product_editor_determine_product_template filter and use it
* Update changelogs and remove unused code
* Remove _product_template_id for products that were created with the new product editor.
* Use only id to find productTemplate
* Turn hook into experimental
* Remove deprecated tests
* Rename filter
* Add more typings to useEntityRecord
* Use hasResolved boolean to check whether product has been resolved
* Add changelog
* Add 'variation' to ProductType
* Don't default to the standard-product-template for variations
* Update changelog
* Accept null in getLayoutTemplateId
* Fix edit variable product test
* Rename hook
* Revert changed logic to avoid regressions
* Increment useProductTemplate logic
* Default to standard-product-template instead of undefined when no matches
* Re-import Features class
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Co-authored-by: Jon Lane <jon.lane@automattic.com>
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