Preserve DM url in og:image without FF

[RitwikSrivastava]

Preserve Adobe Assets/Dynamic Media delivery URLs (*.adobeaemcloud.com/adobe/assets/..., *.scene7.com/is/image/...) as-is when used as page-metadata images (og:image, twitter:image, etc.), instead of rehosting them into the site's local media bucket by default.

Scoped narrowly to metadata images only, via a new isMetadataImage flag on nodes from addMetadata() — regular body images on the same kind of URL are unaffected and keep today's exact rehosting behavior, no config required.

Added isAdobeAssetDeliveryUrl() (domain-anchored, not path-shape-based, to avoid false positives) plus unit and integration tests covering both the exemption and the negative case (body image still uploads).

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