docker: reuse tested images for artifact uploads

[dhalperi]

Publish the architecture-specific image artifacts built during precommit
instead of rebuilding them during the development upload. Assemble the
tested multi-platform manifests from those images, and promote those
manifests for production. Skip development uploads during the production
workflow invocation.

---

Prompt:

I am confused by the upload_dev and upload_prod steps in the
cross-version-test-and-upload workflow.

I would expect that we build the wheel and containers exactly once. We
would upload them as test artifacts and test them, then we would promote
the SAME ARTIFACTS to production by uploading them to real pypi (for
pybatfish) or just adding new labels (docker batfish/allinone). It doesn't
seem that's how it works.

[batfish-bot]

This change is 

[dhalperi]

@dhalperi reviewed 1 file and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on dhalperi).

[dhalperi]

@dhalperi reviewed 1 file and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on dhalperi).