PIMOB:2119 - Country prefilled without saving from billing form was fixed

Issue

Proposed changes

Problem statement: When the merchant has not added any prefilled data navigates to the billing form and selects the country. Observed that country is updated in the payment form without saving it from the billing form. Conflict is happening because the country is directly updating in billing address from the payment state manager

Solution: Added new parameter selectedCountry in paymentstatemanager

Test Steps

Case 1 (same for prefilled data)

open the billing form and select any country
Go back to the payment form, the country should not be updated there

Case-2:

Open the billing form, select any country and save the billing form (For instance, U.K)
Go back to the payment form, the country should be updated there
Open the edit billing form, and change any country (F.i, Ukraine)
Goto the payment form without saving any details in the billing form. A country should be the U.K. in the payment form
Same when open edit billing form country U.K should be selected

Checklist

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[X] Reviewers assigned
[X] I have performed a self-review of my code and manual testing
[X] Lint and unit tests pass locally with my changes
[X] I have added tests that prove my fix is effective or that my feature works
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Further comments

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