**Story**
As a user, I want to see the appropriate image when I preview an article, so that I know whether I want to read it or not
**Background**
PageImages should not return images if they're not in the lead section.
Example: [[https://en.wikipedia.org/w/index.php?title=Intellectual_disability&oldid=641828755 | `[[Intellectual disability]]` ]]'s page image is way, way below the fold and is therefore not a helpful representation of the article in question. In this case it would be more helpful to not have an image at all.
See {T91683}
**Acceptance criteria**
[] Only images in the lead section OR infobox should appear in related pages, hovercards, lead images
[] There should be a feature flag which allows us to turn this on or off and it should default to false
[] It should be enabled in mediawiki-config **after an announcement is sent to wikitech-l**
See also: T151276 [if this change fixes this problem please merge as duplicate and add to test plan]