Jetpack Onboarding: Add country field to business address step

[tyxla]

This PR adds a country field to the business address step. It also updates the settings schema to respect that field. Suggested in p6TEKc-1Rd-p2 and #22530.

Fixes #22530.

Preview:

To test:

• Checkout this branch
• Checkout the Jetpack branch from REST API: Add Country field to Business Address onboarding step jetpack#8874 on your Jetpack site.
• Start the onboarding flow for the Jetpack site by going to /wp-admin/admin.php?page=jetpack&action=onboard&calypso_env=development
• On the site type step, choose Business
• Skip to the Business Address step.
• Verify the country field appears properly.
• Input some data in it, and save the step.
• Verify the country saves properly and goes straight to the address widget.
• Verify a fresh load of this step loads the setting properly.

[matticbot]

Test live: https://calypso.live/?branch=update/jpo-business-address-add-country-field

[oskosk]

Worked great! Leaving and observation but it's not exclusive to this PR.

[oskosk]

The changes here worked Great.

.

I could also confirm that refreshing the page loaded the proper data for the country input

Just an observation. As soon as I got into the business addres form the first time, all of the inputs where red but this is not coming from this PR of course.

[AnnaMag]

LGTM 👍

[AnnaMag]

☝️ oops, apologies for accidental button click.

[AnnaMag]

@oskosk, red fields are an indication of a required input, which makes sense if no address has been provided. This should be filled-in and green when the step had been completed before.
Would you expect to see a different view?

[a8ci18n]

Hi! I've found a possible matching string that has already been translated 34 times:
translate( 'Zip Code' ) ES Score: 15
See 2 additional suggestions in the PR translation status page

Help me improve these suggestions: react with 👎 if the suggestion doesn't make any sense, or with 👍 if it's a particularly good one (even if not implemented).

[oskosk]

@AnnaMag it looked to me at first glance like if the field contents were not valid. There was a bug months ago when you reached the signup form and all of them where read and read that they were invalid (they had the clarification below the error though). I had the same feeling here, associating the red to something that I did wrong.