[Revamp Shipping Labels - Customs] Items warning details

[toupper]

Closes: #13784

Description

With this PR we close the Customs UI task with these additions into the customs items box:

• Empty red boxes in the collapsed state to warn about the required missing data
• Add warning text for required missing data.
• Add warning text for invalid hs tariff number.
• Remove the exclamation mark in the collapsed state when all the required information is available.
• Adding the right keyboard for each case

Note: The currency formatting is coming in a future PR

Steps to reproduce

1. Go to orders
2. Tap on a complete order which can render a shipping label
3. Tap on Create Shipping Label
4. Tap on the Customs pencil button
5. Expand the dummy product detail row
6. Check that a warning text is added when the required fields (Description, Value, Weight) are empty.
7. Check that the HS Tariff also shows a warning text when it's not valid
8. When the box is collapsed, check that we show an empty red box for the missing values

Testing information

N/A

Screenshots

Simulator.Screen.Recording.-.iPhone.16.-.2025-01-09.at.11.46.07.mp4

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

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• 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 all devices (phone/tablet) and no regressions are added.

[wpmobilebot]

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

	App Name	WooCommerce iOS
	Build Number	pr14836-29e156f
	Version	21.3
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	29e156f
	App Center Build	WooCommerce - Prototype Builds #12442

Automatticians: You can use our internal self-serve MC tool to give yourself access to App Center if needed.

[bozidarsevo]

Missing: super.setUp()

[wpmobilebot]

Version 21.4 has now entered code-freeze, so the milestone of this PR has been updated to 21.5.