## Changes
The Unity Catalog volumes API requires a `volume_type` argument when
creating volumes. In the context of DABs, it's unnecessary to require
users to specify the volume type every time. We can default to "MANAGED"
instead.
This PR is similar to https://github.com/databricks/cli/pull/1743 which
does the same for dashboards.
## Tests
Unit test
shreyas-goenka