Add 3D model type to constants

[foroveralls]

Fixes

Fixes #[#658] by @[AetherUnbound]

Description

This PR updates the file media_types.py by adding the media type "3D Model" to the list of possible media types to allow the ingestion server to perform data refreshes for that media type.

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[AetherUnbound]

We have one action failing due to an unrelated issue - this looks good, thanks for the contribution @foroveralls!

[sarayourfriend]

Will merging this now allow ingestion to work before there are 3d models to ingest?

[dhruvkb]

@sarayourfriend yes, adding this should not impact ingestion. The passing CI gives me confidence that everything that works now remains functional after this change.