[CDF-26130]🧹Remove cdf populate (#2143)

# Description

I have checked MixPanel and this command does not seem to be used a
single time. So I suggest we simply remove it instead of deprecating it.

## Changelog

- [x] Patch
- [ ] Skip

## cdf

### Removed

- [alpha] Removed the command `cdf populate`. Instead set the alpha flag
`v07 = true` and use the `cdf data upload instances` instead.
 
## templates

No changes.
