This change ensures that any definitions passed is treated as raw
contents. With this change mistral-dashboard no longer tries to load
contents based on file path or uri passed in by users, and this
prohibits access to any local files or any internal contents accessible
without authentication.
Depends-on: https://review.opendev.org/800950
Closes-Bug: #1931558
Change-Id: I4de45cadc4e174794d0c2ef82223a9da5cbdcabc