"h9 publish" Should Look at Content Type

[freeformflow]

It's possible for a file in a repo to change content type without changing anything within (which is detected by the md5 hash). Add a check for content type in the sync.

[freeformflow]

The content type does not come back in the listObjects scan. We would need to make individual headObject calls to get that data, which is prohibitively expensive. This ticket should be tabled for now. We can revisit later with another approach.