Add product variant translation view

[jwm0]

I want to merge this change because it adds support for translating product variants.

PR intended to be tested with API branch:

Screenshots

Pull Request Checklist

1. This code contains UI changes
2. All visible strings are translated with proper context including data-formatting
3. Attributes [data-test-id] are added for new elements
4. Changes are mentioned in the changelog
5. The changes are tested in different browsers and in light/dark mode

Test environment config

API_URI=https://master.staging.saleor.cloud/graphql/

[patrys]

Task linked: SALEOR-4164 Add missing product variant translations page