[Woo POS payments onboarding] Handle case when we dont know country and currency

[kidinov]

Closes: #12904

Description

The PR:

• Changes the way how we determine country and currency to validate Illegibility for POS
• Fixes crash when WpComWebViewFragment is called in the POS card reader flows It is know that WpComWebViewFragment doesn't work with current implementation of the onboarding flow on the web. There is CUW on that

Steps to reproduce

• Have a site with not active/installed WooPay
• Open POS
• Connected to a reader
• Notice that you can activate/install the plugin

The tests that have been performed

• From the steps to reproduce
• Payments Hub -> Order Card reader to validate that there is no regression due to opening WpComWebViewFragment via Payments nav graph directions

Images/gif

https://github.com/user-attachments/assets/ab07ff67-c52c-4b17-ac9b-9f2446a970ca

https://github.com/user-attachments/assets/bcf521f3-45ba-412f-9492-462ecaa98781

https://github.com/user-attachments/assets/1413c3ef-82f3-49bf-a50d-ecc6220a2e01

• [x] 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.

[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	3e60a27d206e71410f1bbdcbe13f42b616b2f7aa
	Direct Download	woocommerce-wear-prototype-build-pr12908-3e60a27.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	3e60a27d206e71410f1bbdcbe13f42b616b2f7aa
	Direct Download	woocommerce-prototype-build-pr12908-3e60a27.apk

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 40.21%. Comparing base (9ec14d1) to head (ad138a9).

Files with missing lines	Patch %	Lines
...m/woocommerce/android/ui/woopos/WooPosIsEnabled.kt	71.42%	0 Missing and 2 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 12882-woo-pos---payments-onboarding-show-payments-onboarding-from-existing-design #12908 +/- ## ======================================================================================================================= - Coverage 40.22% 40.21% -0.01% + Complexity 5794 5793 -1 ======================================================================================================================= Files 1253 1253 Lines 71273 71268 -5 Branches 9957 9956 -1 ======================================================================================================================= - Hits 28669 28663 -6 Misses 39975 39975 - Partials 2629 2630 +1 ```

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