Spread metadata to allow default attributes to work when loading Checkout block in frontend

[opr]

This PR ensures default attributes from metadata are passed to the front end block.

Fixes #5723

Testing

Automated Tests

• Changes in this PR are covered by Automated Tests.
  • Unit tests
  • E2E tests

Manual Testing

How to test the changes in this Pull Request:

1. Add the Checkout block and select the Shipping Address in the editor.
2. Change the settings (try a few different, random settings) in the sidebar and ensure the block changes as expected.
3. Save the block and load it on the front-end and ensure the block is rendered as you expect based on the attributes you saved.
4. Go back to the editor and select the Checkout block as a whole, set the "Dark mode inputs" option to true.
5. Load the block in the front-end again and ensure the dark mode inputs are being used.

User Facing Testing

These are steps for user testing (where "user" is someone interacting with this change that is not editing any code).

• Same as above, or
• See steps below.

Changelog

Fixed an issue where default block attributes were not being passed to the Checkout block correctly.

[github-actions]

Size Change: +126 B (0%)

Total Size: 813 kB

Filename	Size	Change
build/active-filters-frontend.js	6.37 kB	+1 B (0%)
build/all-products-frontend.js	18.7 kB	-3 B (0%)
build/atomic-block-components/add-to-cart-frontend.js	6.89 kB	-2 B (0%)
build/atomic-block-components/button-frontend.js	1.48 kB	+2 B (0%)
build/atomic-block-components/category-list-frontend.js	457 B	-1 B (0%)
build/atomic-block-components/price-frontend.js	1.74 kB	+2 B (0%)
build/atomic-block-components/stock-indicator-frontend.js	939 B	-1 B (0%)
build/atomic-block-components/summary-frontend.js	1.24 kB	+1 B (0%)
build/atomic-block-components/tag-list-frontend.js	460 B	+1 B (0%)
build/atomic-block-components/title-frontend.js	1.21 kB	+3 B (0%)
build/cart-blocks/accepted-payment-methods-frontend.js	1.14 kB	-1 B (0%)
build/cart-blocks/empty-cart-frontend.js	345 B	-1 B (0%)
build/cart-blocks/items-frontend.js	299 B	+1 B (0%)
build/cart-blocks/line-items-frontend.js	5.49 kB	-1 B (0%)
build/cart-blocks/order-summary-frontend.js	8.94 kB	-10 B (0%)
build/cart-blocks/totals-frontend.js	320 B	-1 B (0%)
build/cart-frontend.js	45.5 kB	+4 B (0%)
build/checkout-blocks/actions-frontend.js	1.39 kB	-1 B (0%)
build/checkout-blocks/contact-information-frontend.js	2.95 kB	-2 B (0%)
build/checkout-blocks/express-payment-frontend.js	5.46 kB	-1 B (0%)
build/checkout-blocks/fields-frontend.js	344 B	+1 B (0%)
build/checkout-blocks/order-note-frontend.js	1.13 kB	+1 B (0%)
build/checkout-blocks/order-summary-frontend.js	11.4 kB	-10 B (0%)
build/checkout-blocks/payment-frontend.js	7.71 kB	+1 B (0%)
build/checkout-blocks/shipping-address-frontend.js	975 B	+1 B (0%)
build/checkout-blocks/shipping-methods-frontend.js	4.92 kB	+3 B (0%)
build/checkout-blocks/totals-frontend.js	324 B	+1 B (0%)
build/checkout-frontend.js	47.6 kB	+129 B (0%)
build/mini-cart-component-frontend.js	14.3 kB	+3 B (0%)
build/mini-cart-frontend.js	1.78 kB	+2 B (0%)
build/price-filter-frontend.js	12.6 kB	+1 B (0%)
build/reviews-frontend.js	7.35 kB	-1 B (0%)
build/single-product-frontend.js	22.2 kB	+3 B (0%)
build/stock-filter-frontend.js	6.61 kB	-2 B (0%)
build/vendors--atomic-block-components/add-to-cart--cart-blocks/order-summary--checkout-blocks/billing-ad--c5eb4dcd-frontend.js	19 kB	+2 B (0%)
build/vendors--atomic-block-components/add-to-cart-frontend.js	7.51 kB	+1 B (0%)
build/vendors--cart-blocks/line-items--checkout-blocks/order-summary-frontend.js	3.14 kB	-1 B (0%)
build/vendors--cart-blocks/order-summary--checkout-blocks/billing-address--checkout-blocks/order-summary---eb4d2cec-frontend.js	4.74 kB	+1 B (0%)

ℹ️ View Unchanged

Filename	Size
build/active-filters.js	7.05 kB
build/all-products.js	33.8 kB
build/all-reviews.js	8.06 kB
build/atomic-block-components/add-to-cart--atomic-block-components/button--atomic-block-components/image---8f355022.js	255 B
build/atomic-block-components/add-to-cart--atomic-block-components/button--atomic-block-components/image---a7e2bb9b.js	2.67 kB
build/atomic-block-components/add-to-cart--atomic-block-components/button.js	1.48 kB
build/atomic-block-components/add-to-cart.js	6.46 kB
build/atomic-block-components/button.js	853 B
build/atomic-block-components/category-list.js	459 B
build/atomic-block-components/image-frontend.js	1.37 kB
build/atomic-block-components/image.js	1.05 kB
build/atomic-block-components/price.js	1.7 kB
build/atomic-block-components/rating-frontend.js	703 B
build/atomic-block-components/rating.js	700 B
build/atomic-block-components/sale-badge-frontend.js	625 B
build/atomic-block-components/sale-badge.js	624 B
build/atomic-block-components/sku-frontend.js	386 B
build/atomic-block-components/sku.js	386 B
build/atomic-block-components/stock-indicator--atomic-block-components/summary--atomic-block-components/title.js	468 B
build/atomic-block-components/stock-indicator.js	623 B
build/atomic-block-components/summary.js	926 B
build/atomic-block-components/tag-list.js	459 B
build/atomic-block-components/title.js	935 B
build/attribute-filter-frontend.js	16.8 kB
build/attribute-filter.js	13.1 kB
build/blocks-checkout.js	17.6 kB
build/cart-blocks/checkout-button-frontend.js	1.14 kB
build/cart-blocks/express-payment-frontend.js	5.18 kB
build/cart-blocks/filled-cart-frontend.js	766 B
build/cart.js	43.7 kB
build/checkout-blocks/billing-address--checkout-blocks/shipping-address-frontend.js	4.23 kB
build/checkout-blocks/billing-address-frontend.js	887 B
build/checkout-blocks/terms-frontend.js	1.22 kB
build/checkout.js	45.2 kB
build/featured-category.js	8.61 kB
build/featured-product.js	9.62 kB
build/handpicked-products.js	7.09 kB
build/legacy-template.js	2.18 kB
build/mini-cart-contents.js	3.82 kB
build/mini-cart.js	6.39 kB
build/price-filter.js	8.51 kB
build/price-format.js	1.18 kB
build/product-best-sellers.js	7.37 kB
build/product-categories.js	3.17 kB
build/product-category.js	8.49 kB
build/product-new.js	7.66 kB
build/product-on-sale.js	7.99 kB
build/product-search.js	2.18 kB
build/product-tag.js	7.8 kB
build/product-top-rated.js	7.9 kB
build/products-by-attribute.js	8.39 kB
build/reviews-by-category.js	11.5 kB
build/reviews-by-product.js	12.6 kB
build/single-product.js	10 kB
build/stock-filter.js	6.68 kB
build/vendors--atomic-block-components/price--cart-blocks/line-items--cart-blocks/order-summary--checkout--8a3571de-frontend.js	5.71 kB
build/wc-blocks-data.js	8.84 kB
build/wc-blocks-editor-style-rtl.css	4.79 kB
build/wc-blocks-editor-style.css	4.79 kB
build/wc-blocks-google-analytics.js	1.56 kB
build/wc-blocks-middleware.js	949 B
build/wc-blocks-registry.js	2.7 kB
build/wc-blocks-shared-context.js	1.52 kB
build/wc-blocks-shared-hocs.js	1.14 kB
build/wc-blocks-style-rtl.css	21.9 kB
build/wc-blocks-style.css	21.9 kB
build/wc-blocks-vendors-style-rtl.css	1.28 kB
build/wc-blocks-vendors-style.css	1.28 kB
build/wc-blocks-vendors.js	69.7 kB
build/wc-blocks.js	2.62 kB
build/wc-payment-method-bacs.js	816 B
build/wc-payment-method-cheque.js	811 B
build/wc-payment-method-cod.js	909 B
build/wc-payment-method-paypal.js	837 B
build/wc-settings.js	2.61 kB

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[nielslange]

LGTM! 🚢