[Shipping Labels Revamp] Wire package networking with UI

[ThomazFB]

Summary

Partially fix issue #12284 by completing the Package mapping and wiring from the networking request into the UI, but without the full JSON serialization from the network layer.

The next PR will finish the entire data acquisition flow and will require a reviewer.

How to Test

1. This is not testable as it is; since the code is unreachable from the UI, there's only a unit test covering it.

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	4d99c06
	Direct Download	woocommerce-wear-prototype-build-pr13028-4d99c06.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	4d99c06
	Direct Download	woocommerce-prototype-build-pr13028-4d99c06.apk

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 68.79433% with 44 lines in your changes missing coverage. Please review.

Project coverage is 39.81%. Comparing base (95ad84b) to head (4d99c06).
Report is 305 commits behind head on trunk.

Files with missing lines	Patch %	Lines
...i/orders/wooshippinglabels/packages/ui/UIModels.kt	54.71%	23 Missing and 1 partial ⚠️
...ckages/datasource/WooShippingLabelPackageMapper.kt	0.00%	15 Missing ⚠️
.../packages/components/WooShippingPackageListItem.kt	0.00%	2 Missing ⚠️
...ges/datasource/FetchPredefinedPackagesFromStore.kt	95.55%	0 Missing and 2 partials ⚠️
...oshippinglabels/packages/datasource/PackageDAOs.kt	93.75%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##              trunk   #13028      +/-   ##
============================================
+ Coverage     39.72%   39.81%   +0.08%     
- Complexity     6036     6046      +10     
============================================
  Files          1274     1274              
  Lines         73453    73441      -12     
  Branches      10074    10083       +9     
============================================
+ Hits          29177    29237      +60     
+ Misses        41701    41626      -75     
- Partials       2575     2578       +3     

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