[4.0] Add two new link attributes

[ot2sen]

Is your feature request related to a problem? Please describe.

Google is evolving the nofollow attribute by adding two new attributes for better flagging Sponsored content and User Generated Content.
rel="sponsored" and rel="ugc"

Ref.: https://webmasters.googleblog.com/2019/09/evolving-nofollow-new-ways-to-identify.html

Describe the solution you'd like

We could add these to the already existing options in menus, content, categories, etc.

Additional context

[simbus82]

Great @ot2sen!
For SEO then is needed to select one or more attributes like these, so this field should be a multiselect.

[alikon]

please test #28055