[Shipping labels] Use fetched shipments in split shipment screen

[irfano]

Closes WOOMOB-416

Description

This completes the UI parts of fetching shipments from the backend.

Warning

Review #13995 first.

Steps to reproduce

1. On the web, create an order with shipments.
2. In the app, open the Orders tab.
3. Tap the order you created on the web.
4. Tap on Create shipping label.
5. Tap Split shipment.
6. Verify that the shipments match those on the web.

Testing information

• Test an order that has shipments
• Test an order that has shipments with the same product type in separate shipments
• Test a new order that has no shipments
• Remove shipments
• Move items

The tests that have been performed

Steps above

Images/gif

after.webm

• I have considered if this change warrants release notes and have added them to RELEASE-NOTES.txt if necessary. Use the "[Internal]" label for non-user-facing changes.

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.

[irfano]

For now, I used flatten() to display all items on the creation screen, since the creation screen doesn’t support shipments yet.

[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	6ec3886
	Direct Download	woocommerce-wear-prototype-build-pr13998-6ec3886.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	6ec3886
	Direct Download	woocommerce-prototype-build-pr13998-6ec3886.apk

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 84.09091% with 7 lines in your changes missing coverage. Please review.

Project coverage is 38.27%. Comparing base (1053e9e) to head (6ec3886).

Files with missing lines	Patch %	Lines
...ndroid/ui/orders/wooshippinglabels/GetShipments.kt	87.50%	0 Missing and 4 partials ⚠️
...orders/wooshippinglabels/models/ShipmentUIModel.kt	60.00%	2 Missing ⚠️
...hippinglabels/WooShippingLabelCreationViewModel.kt	75.00%	1 Missing ⚠️

Additional details and impacted files

@@                                Coverage Diff                                 @@
##             issue/WOOMOB-416-split-shipment-config-endpoint   #13998   +/-   ##
==================================================================================
  Coverage                                              38.26%   38.27%           
- Complexity                                              9490     9495    +5     
==================================================================================
  Files                                                   2119     2120    +1     
  Lines                                                 116394   116405   +11     
  Branches                                               14937    14939    +2     
==================================================================================
+ Hits                                                   44542    44552   +10     
+ Misses                                                 67781    67780    -1     
- Partials                                                4071     4073    +2     

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