Yoast social images use all attachments with filesize

[joehoyle]

When building the index for attachments (and quite possibly in other areas too), Yoast will filter the attachment image sizes (by default full, large, medium_large) by filesize (see https://github.com/Yoast/wordpress-seo/blob/trunk/inc/class-wpseo-image-utils.php#L340) to exclude anything that is over 2MB.

In conjunction with S3 uploads, this makes these functions very slow, as each image has to be pulled from S3 in full to check it's file size.

Rather than using the image sizes at all, in Altis it seems we should just be passing a tachyon image somehow and not going any of those checks etc.