[Shipping labels] Update local requirements for address fields

[rachelmcr]

Part of: #13781

Description

This updates some of the local requirements for address fields in the Woo Shipping label flow. Instead of a fixed set of required fields, this moves the checks for whether a field is required into the view model. This will allow us to update the requirements based on data in the view model.

Changes in this PR:

• Moves the checks for whether a field is required into the view model.
• Adds the phoneNumberRequired property. The phone number is always required for origin addresses but not always required for destination addresses, so this is a step toward making the view and view model useful for both address types.
• Updates the check for name and company fields, so that only one is required. (If one field is non-empty, the other becomes optional.)

Future PRs will continue to update the local requirements, add validation, and prepare the view model for reuse for destination addresses.

Testing information

1. Ensure the Woo Shipping extension is installed, activated, and set up on your store.
2. Create or open an order with at least one physical product and the processing status.
3. Tap "Create Shipping Label" in order details.
4. Open the "Shipment details" bottom sheet.
5. Tap the "Ship from" origin address.
6. Tap the edit (pencil) icon on one of the origin addresses.
7. In the address form, confirm you see a * to indicate the phone number field is required.
8. Clear the company field and confirm the name field is marked as required, while the company field is optional.
9. Clear the name field and confirm the company field is marked as required, while the name field is optional.
10. Confirm all other fields are still marked as required.

Note: If both the name and company field are empty, they are both marked as required until one is entered. If both the name and company field are populated, they are both marked as optional until one is cleared.

Screenshots

Name required	Company required	Phone required

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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.

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 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	pr14865-32c8a1d
	Version	21.4
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	32c8a1d
	App Center Build	WooCommerce - Prototype Builds #12527

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

[toupper]

LGTM! 🚀 🚢