[Feature] Support --empty flag for snapshots

[d-cole]

Is this your first time submitting a feature request?

• I have read the expectations for open source contributors
• I have searched the existing issues, and I could not find an existing issue for this feature
• I am requesting a straightforward extension of existing dbt functionality, rather than a Big Idea better suited to a discussion

Describe the feature

Support the empty flag for snapshots. Currently, dbt snapshot --empty results in the error: "Error: No such option: --empty Did you mean --help?". This means unit tests for models downstream of snapshots cannot run with the usual workflow.

Describe alternatives you've considered

Running upstreams of snapshots with --empty then running the snapshots. This makes configuring unit tests in CI much more complex as you need the additional steps:

• Identify snapshots upstream of modified models
• Run upstreams of snapshots as empty
• Run snapshots

Who will this benefit?

Users of unit tests and snapshots

Are you interested in contributing this feature?

No response

Anything else?

No response

[dbeatty10]

Thanks for opening this @d-cole !

We've got something similar open for seeds as well: #8981

We've added your issue for snapshots to #10151.

[d-cole]

Great, thank you @dbeatty10!