Webfiles in old data model - load optimization and support webfiles browser refresh load

[tyaginidhi]

This PR addresses the following scenario:

1. For a website, only load annotations (aka CSS/media file etc - related to the portal data currently being viewed). For old data model - we did not have annotation entity distribution per portal. This information is now being proactively fetched from adx_webfiles entity.
2. This PR also introduces the media file optimization we are doing for new data model - where we load all text files like css/txt on first load, while media files like jpeg/mp4 are loaded on file explorer file's click.
3. This also addresses the gap where now on browser refresh webfiles currently open in browser can be directly fetched from Dataverse - without waiting for the entire portal data to be loaded first.