zink: revert mr 7193
This reverts !7193 (merged) in its entirety. This MR, while it had some nice stuff also didn't really play nice with how hash-tables and state-updates worked, and ended up breaking some things pretty badly (but subtly).
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
This reverts !7193 (merged) in its entirety. This MR, while it had some nice stuff also didn't really play nice with how hash-tables and state-updates worked, and ended up breaking some things pretty badly (but subtly).