[Shipping labels] Add UI for selected package and shipment weight

[rachelmcr]

Part of: #14522

Description

This adds the UI for displaying the selected package and total shipment weight in the Woo Shipping label creation flow.

How

• Moves the reusable PackageOptionView to a separate file for visibility.
  • Updates this view to make the selector optional, so the view can be used for the selected package.
  • Fixes a couple small text style issues in the view.
• Adds SelectedPackageView to display the package section with the selected package and total shipment weight.
  • This view has an edit button, for editing the selected package; the action will be added in a future PR.
  • For now, this view isn't yet used on the main screen for the Woo Shipping flow; it will be added (with real data) in a future PR.

Testing information

Prerequisite: The Woo Shipping extension is active on your store and you have at least one order eligible for a shipping label (with processing status and at least one physical product).

1. Enable the revampedShippingLabelCreation feature flag.
2. Build and run the app.
3. Go to the Orders tab.
4. Select an order eligible for a shipping label.
5. Tap "Create Shipping Label."
6. Tap "Select a package."
7. Confirm the rows in the carriers and saved tab look the same as before.

Screenshots

SwiftUI preview of the new view:

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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	pr14565-4bdd12e
	Version	21.2
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	4bdd12e
	App Center Build	WooCommerce - Prototype Builds #11877

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