* fix(backup) use correct db filename in backup EE-2413
* also add missing restore database filename
* fix test datastore, go test
* Remove the json export. Its insecure and was meant to be for dev/testing
* remove portainer.db from filesToRestore
* fix(db) NeedsEncryptionMigration EE-2414
* Also detect both portainer.db and portainer.edb. Should be fatal. Ensure calls to Fatal return a value (for testing)
* Post tech review improvements