* remove dashboard previews backend
* remove dashboard previews backend
* bring back the migration
* bring back the migration
* bring back the migration
* refactor apis for consistent outputs
* add dashboardUid validation at API layer
* add check for empty dashboardUid on SavePublicDashboard
* remove public dashboard errors from models package.
Co-authored-by: Ezequiel Victorero <evictorero@gmail.com>
* chore/backend: move dashboard errors to dashboard service
Dashboard-related models are slowly moving out of the models package and into dashboard services. This commit moves dashboard-related errors; the rest will come in later commits.
There are no logical code changes, this is only a structural (package) move.
* lint lint lint