Don't Merge Display Date in Manifest Metadata

[joncameron]

Description

Un-combining the display date so it is two separate metadata values in the IIIF manifest.

Example

"Publication date: #{media_object.date_issued}" if media_object.date_issued.present?
"Creation date: #{media_object.date_created}" if media_object.date_created.present?

See https://github.com/avalonmediasystem/avalon/pull/6047/files/749215c386243e17037770743f8121f189657760#r1772058052

Done Looks Like

• Manifest generation changed to include both date values if present as separate fields