Return form quick fixes

[bmigirl]

I want to merge this change because it fixes return form:

• not redirecting after successful return/refund
• refund button not being disabled when no products selected
• refund in form data being set to true even when captured total at order was 0
• also made a class of parser

PR intended to be tested with API branch:

Screenshots

Pull Request Checklist

1. All visible strings are translated with proper context.
2. All data-formatting is locale-aware (dates, numbers, and so on).
3. Translated strings are extracted.
4. Number of API calls is optimized.
5. The changes are tested.
6. Data-test are added for new elements.
7. Type definitions are up to date.
8. Changes are mentioned in the changelog.

Test environment config

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