[Shipping labels] Handle country and state selection for origin addresses

[rachelmcr]

Part of: #13781
⚠️ Depends on #14866 ⚠️

Description

This adds support for selecting a country and state when editing an origin address in the Woo Shipping label flow.

Apologies for the slightly large PR; many of the lines of changes are from unit tests. I thought this was preferable to splitting the PR, given that it's hard to test the fetching behavior without the corresponding selection UI.

Updated behavior:

• The address form now fetches a list of countries from remote/storage to use for selecting a new country and state.
• You can now tap on the country in the address form to open a list of countries and select a new country.
• When editing an origin address, the list of countries is filtered to USPS-approved countries. (This matches the legacy behavior and extension behavior; it is hardcoded because there isn't a list of supported countries available from the API.)
• When you select a new country, it clears the previous state selection. (If you keep the same country selection, the state won't change.)
• If you select a country with a list of states, you can tap on the state in the address form to open the list and select a new state.
• If you select a country that doesn't have a list of states, the state field becomes an optional text field. (This matches the web behavior.)

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. Confirm the country and state fields show the expected values for the selected address.
8. Tap the country and confirm it opens the list of USPS-approved countries.
9. Confirm you can filter the list and select a new country.
10. Confirm that if you select a new country, the state field is cleared.
11. Select a country that includes states (i.e. the US) and confirm you can tap the state field to open a list of states to select form. Confirm your new selection is reflected in the form.
12. Select a country without states and confirm the state field becomes a text field that you can edit.

Screenshots

Simulator.Screen.Recording.-.iPhone.16.Pro.-.2025-01-14.at.18.14.01.mp4

---

• 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	pr14867-9f0e01e
	Version	21.4
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	9f0e01e
	App Center Build	WooCommerce - Prototype Builds #12543

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

[toupper]

Good work @rachelmcr! It looks good to me. One minor thing, I noticed that in the Country/State selector we don't have any Cancel/Done button, but the user has to pull down the screen after selecting an item. I wonder if you consider adding buttons to make the selection more intuitive?

[toupper]

LGTM, I just left a minor conmment regarding UI. 🚀 🚢

[rachelmcr]

I noticed that in the Country/State selector we don't have any Cancel/Done button, but the user has to pull down the screen after selecting an item. I wonder if you consider adding buttons to make the selection more intuitive?

Good point. I had considered adding those nav buttons, but since we use the same view for editing addresses elsewhere (in an order) I decided to keep using it as-is for consistency. However, I see now that where it's used for order addresses the selection view is automatically popped when the selection is made. As far as I can tell that's not actually the intended behavior, and I'm not sure we want it in this context, but it does mean the user interaction is a bit different.

After thinking it over, I decided to add a Done button here for ease of dismissing the view; that is updated in 9f0e01e. I'm not adding a Cancel button because the view changes the selection immediately, so adding a cancel action would require more involved updates to the view that I think are not worth the effort. Let me know if you have other thoughts/suggestions about that. :)

Country	State