Feat/change nicename UI

[leogermani]

All Submissions:

• Have you followed the Newspack Contributing guideline?
• Does your code follow the WordPress' coding standards and VIP Go coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

This is an experimental UI to #3725.

This is not meant to be enabled for every user, but it can be enabled if there's a special need for this feature.

How to test the changes in this Pull Request:

1. add define( 'NEWSPACK_CHANGE_NICENAME_UI', true );
2. Edit a user
3. Confirm there's a new section called "Change User archive URL"
4. Check test instructions on feat: handle user nicename change #3725 and perform them, but using the UI this time

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

[dkoo]

It works! Since this is experimental we probably don't need to request a design review at this point. ESLint is throwing some code style errors which I think can be fixed with the below suggestions.

[leogermani]

Thanks @dkoo !

[github-actions]

Hey @leogermani, good job getting this PR merged! 🎉

Now, the needs-changelog label has been added to it.

Please check if this PR needs to be included in the "Upcoming Changes" and "Release Notes" doc. If it doesn't, simply remove the label.

If it does, please add an entry to our shared document, with screenshots and testing instructions if applicable, then remove the label.

Thank you! ❤️

[matticbot]

🎉 This PR is included in version 6.0.0-alpha.2 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀