Bench test whether `1.132.3` to `3.2.2` works in one hop

[alextran1502]

Part of #611

Docs do not say whether the VectorChord conversion still runs when the first VectorChord capable server booted is a v3 server. Decides 3 hop vs 4 hop.

Blocked by: A2.3

Phase: M2 Dec — Dogfood