Let makeOutboundLink handle rel attribute automatically

[afercia]

Supersedes Yoast/yoast-components#829

Summary

This PR can be summarized in the following changelog entry:

• [components, algolia-searchbox, configuration-wizard, helpers, yoast-components] Improve handling of the rel attribute for links that open in a new browser's tab

Relevant technical choices:

• tests for links that point to Yoast to handle the rel attribute automatically
• removes the explicitly passed props rel={ null } as they're no longer necessary
• uses makeOutboundLink instead of hardcoded links where necessary
• fixes a prop type

As per Yoast/wordpress-seo#4605 (comment), the desired behavior is:

• use noopener for all the non-yoast.com external links
• omit it for the yoast.com links (including shortened links)

Test instructions

This PR can be tested by following these steps:

• go in the standalone app > "Components" tab
• in the section "Outbound links" there are a few link examples
• check the output is the expected one
• optionally: check links in components that use makeOutboundLink e.g.:
  • the links in the Dashboard Widget
  • the change language link in content analysis
  • the link in the Checkbox (standalone app "UI controls" tab)

UI changes

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

Fixes Yoast/yoast-components#828

[johannadevos]

@afercia Unfortunately this one has lots of merge conflicts also... Could you please resolve them before we move on to code review?

[afercia]

Solved merge conflicts. This was a bit complicated 😄

[hwinne]

CR done 👍

[igorschoester]

Acceptance ✅