[Shipping Label Revamp] Add Product Details UI

[ThomazFB]

Summary

Partially fix issue #13367 by introducing the Product Details UI elements and the ShippingItems data from the main Creation form into the Customs form.

Upcoming PRs will add data validation and error handling.

Screen Capture

Screen_recording_20250225_215211.mp4

How to Test

In case you want to avoid having to fill the address data to access the Customs form, you can simply override the ShouldRequireCustomsForm use case always to return true to trigger the Customs data requirement forcefully.

1. Open the Shipping Labels Creation form, verify the Shippable Items declared in the form
2. Click the edit button inside the Customs section
3. Once inside the Customs form, check the Product Details reflects exactly the Shippable Items
4. Click on each Item and verify they expand and collapse as expected

Update release notes:

• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

Reviewer (or Author, in the case of optional code reviews):

Please make sure these conditions are met before approving the PR, or request changes if the PR needs improvement:

• The PR is small and has a clear, single focus, or a valid explanation is provided in the description. If needed, please request to split it into smaller PRs.
• Ensure Adequate Unit Test Coverage: The changes are reasonably covered by unit tests or an explanation is provided in the PR description.
• Manual Testing: The author listed all the tests they ran, including smoke tests when needed (e.g., for refactorings). The reviewer confirmed that the PR works as expected on big (tablet) and small (phone) in case of UI changes, and no regressions are added.

[dangermattic]

	1 Warning
⚠️	This PR is larger than 300 lines of changes. Please consider splitting it into smaller PRs for easier and faster reviews.

Generated by 🚫 Danger

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce-Wear Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce-Wear Android
	Platform	⌚️ Wear OS
	Flavor	Jalapeno
	Build Type	Debug
	Commit	a383ff4
	Direct Download	woocommerce-wear-prototype-build-pr13600-a383ff4.apk

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce Android
	Platform	📱 Mobile
	Flavor	Jalapeno
	Build Type	Debug
	Commit	a383ff4
	Direct Download	woocommerce-prototype-build-pr13600-a383ff4.apk

[wpmobilebot]

Version 21.8 has now entered code-freeze, so the milestone of this PR has been updated to 21.9.

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