Add Commercial Rich Link AB test

[domlander]

What does this change?

Adds a new AB test: commercial-rich-links.

Why?

This AB test will include a fix for ad insertion around rich links and will reduce restrictions on ads placed around rich links.

The fix

• Currently, ad insertion does not wait for the rich link image to load, causing a race condition between Spacefinder and the rich link image: sometimes the image has rendered when Spacefinder inserts inline ads and sometimes not. When the image has not loaded, the inline ad can be inserted too close to the rich link.

Reduced restrictions

• From the left-col breakpoint, rich links appear entirely in the left-column. As long as we avoid placing an advert above the paragraph that the rich link targets, we don't need to avoid this element when inserting adverts.
• At mobile/tablet breakpoints, reduce the amount of space required between the bottom of an advert and the top of a rich link. Currently, a paragraph needs 200px of space between its top and the top of a rich link, and 35px between its top and the bottom of an advert. Rich links are only 140px wide so the visual weight of ads and rich links is not too strong.

The following test variants will be included:

Variant name	Description
control	Current behaviour
variant-fix	Only includes the fix
variant-uplift	Includes both the fix and reduced restrictions on ad insertion

[github-actions]

Deploy build 30428 of dotcom:rendering-all to CODE

All deployment options

• Deploy build 30428 of dotcom:rendering-all to CODE
• Deploy parts of build 30428 to CODE by previewing it first
• What's on CODE right now?

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From guardian/actions-riff-raff.