Check for shipping label support

[atorresveiga]

Part of: #12444

Description

This PR introduces the ShippingLabelSupport enum to give us more control over the shipping label flow. With the changes introduced here, we can check if an order supports purchasing shipping labels and whether we should use the new or legacy flow.

Testing information

TC1

1. Install & Activate the WCS&T plugin on your store
2. Check that the purchase shipping label flow keeps working as expected

TC2

1. Install & Activate the WCS plugin on your store
2. Check that the purchase shipping label flow keeps working as expected

The tests that have been performed

1. Tested that the purchase shipping label flow keeps working as expected using the WCS&T and the WCS plugins

• 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.

[dangermattic]

	1 Warning
⚠️	This PR is assigned to the milestone 20.9. This milestone is due in less than 2 days. Please make sure to get it merged by then or assign it to a milestone with a later deadline.

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	5746370
	Direct Download	woocommerce-wear-prototype-build-pr12617-5746370.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	5746370
	Direct Download	woocommerce-prototype-build-pr12617-5746370.apk

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 77.27273% with 5 lines in your changes missing coverage. Please review.

Project coverage is 40.84%. Comparing base (fa9bb72) to head (5746370).
Report is 13 commits behind head on trunk.

Files with missing lines	Patch %	Lines
...rders/details/ShippingLabelOnboardingRepository.kt	73.68%	1 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##              trunk   #12617   +/-   ##
=========================================
  Coverage     40.84%   40.84%           
+ Complexity     5755     5751    -4     
=========================================
  Files          1237     1237           
  Lines         69742    69751    +9     
  Branches       9680     9685    +5     
=========================================
+ Hits          28484    28490    +6     
- Misses        38634    38635    +1     
- Partials       2624     2626    +2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.