Description

Part of https://docs.google.com/document/d/1RgY1N5MCNQAiKM3EK0bgvw7CZ8TolR81dF2QCNzTM2s/edit

We want to add the ability for versions to be soft-blocked.

Minimal changes to the admin should be included to make it possible to test this.

In follow-up tickets we'll add more admin functionality and generate a separate set of bloomfilter and stashes for soft-blocked versions - for now, this is about making it possible to add a soft-block internally without breaking anything.

Note that while in practice this is unlikely to come up very often, for a given Block we might end up with versions that are hard-blocked and versions that are soft-blocked : we are going to add the information of whether something is soft or hard-blocked on the BlockVersion itself.

Acceptance Criteria

Checks

• If the issue is ready to work on, I have removed the "needs:info" label.
• If I have identified that the work is specific to a repository, I have removed "repository:addons-server" or "repository:addons-frontend"

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