Summary: we need to translate between the pbs we're using internally to the new vizierpb format. these are just the utils to do so, the code that actually applies the translation will be in a followup diff.

Test Plan: unit test, tested when running skaffold

Reviewers: zasgar, #engineering

Reviewed By: zasgar, #engineering

Differential Revision: https://phab.corp.pixielabs.ai/D3572

GitOrigin-RevId: 7c0c522ff20ae22e8b487fe2d02df917261b22db