Griffin process update to support automatization and automatic tests

[goodov]

Our Griffin study release process is far from perfect. It requires a lot of manual work. This should be improved to allow automated studies rollout/archive, auto-tests and simplified manual PR testing.

spec (in progress) https://docs.google.com/document/d/1JjcRI7NMelBzpkrbw9QyiRM0ZERp0zcO27ewaCYKhUo/edit