Missing images in metadata for facebook and hdfs Quarkus extensions

[holly-cummins]

Bug description

Missing image: https://camel.apache.org/_/img/logo-d-f21b25ba38.svg

The problem image was found on these artifacts: [org.apache.camel.quarkus:camel-quarkus-facebook::jar:3.6.0, org.apache.camel.quarkus:camel-quarkus-hdfs::jar:3.6.0]

(I know they're unlisted, but we still validate the metadata. We also, at the moment, validate the image links for deprecated extensions. We don't validate the guides links on deprecated extensions, since, by definition, their content may be a bit stale. Let me know if you want to extend the same logic to images for deprecated extensions - although that wouldn't actually affect these two cases.)