[Feature] Update Publications if outdated

**Packages**

Media (will likely involve Core)

**Is your feature request related to a problem? Please describe.**

N/A

**Describe the solution you'd like**

Publications themselves sometimes receive updates, normally this is just to text but can also contain bigger changes, such as an image change.

I have no idea how this is checked internally. We need to figure that out and then apply the same check on each download to make sure we currently have the latest version downloaded in Media.

**Describe alternatives you've considered**

Deleting cache and restarting.

**Additional context**

N/A

Start by tracing how the Media and Core packages download and cache publications, then identify any existing internal freshness checks. Done means each download can detect outdated publication text or images and obtain the latest version without requiring cache deletion and a restart.

Written by the indexing model from the issue text.