Configuration wizard: add input validation to social accounts

[afercia]

Summary

This PR can be summarized in the following changelog entry:

• Add input validation to the Configuration Wizard social accounts

Relevant technical choices:

This PR leverages browsers constraint validation API for the Social Accounts URL fields in the Configuration Wizard, and basically does what https://github.com/Yoast/wordpress-seo/pull/12242 does for the Social Accounts settings page.

• adjusts Step, Textfield, and Input components to have the necessary props / attributes
• wraps the step fields in a <form> element when the new prop hasValidation is true (constraint validation needs a form element to work)

Test instructions

This PR can be better tested in the plugin, please follow instructions from the related PR on wordpress-seo https://github.com/Yoast/wordpress-seo/pull/12242

UI changes

• [x] This PR changes the UI in the plugin. I have added the 'UI change' label to this PR.

See https://github.com/Yoast/wordpress-seo/issues/12173 Fixes https://github.com/Yoast/wordpress-seo/issues/12373

[bintzandt]

Transferred to https://github.com/Yoast/javascript/pull/10