I believe that changing the requiredness of the `address_1` and `country_code` fields when any part of the address was filled was not being registered correctly with the form state representation of those fields. ~~Have added an effect that unregisters the fields when the requiredness state changes and allows them to be re-registered with the correct `required` value when the next re-render happens due to that state having changed.~~
Have updated the submit button to be available even if form is invalid.
Resolves CORE-1266
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