bug: use Accept header to return other formats

[carlinmack]

❤️ Thank you for your contribution!

Close #2949

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[fenekku]

Hey there 👋 , in conversation with @ptamarit this PR was brought up. Just wanted to mention that InvenioRDM does content-negotiation differently unfortunately. See https://github.com/inveniosoftware/flask-resources/blob/master/flask_resources/content_negotiation.py for how.

[github-actions]

This PR was automatically marked as stale.