[CDF-26070] 🔨 Download table format (#2152)

# Description

Testing the upload /download functionality and finding issues. 

## Changelog

- [x] Patch
- [ ] Skip

## cdf

### Fixed

- [alpha] When running `cdf data download`, Toolkit now sanitize the
name for the data directory it creates.
- [alpha] When running `cdf data download assets` no longer skips
metdata when a `.csv` or `.parquet` is selected as the
  output format. 

## templates

No changes.
