Upgrade @bufbuild/protbuf to v2

[dylanratcliffe]

sdp-js has a PR to update protobuf to V2: #203 This will require some additional work before it can be merged, including updating the frontend: https://github.com/overmindtech/frontend/pull/1453 and potentially upgrading the generation libraries used in sdp (though I'm nil 100% sure about that)

This should all be merged assuming it works, and any cleanup done as part of the major version upgrade. Also might as well close a bunch of the other PRs while you're at it

[getinnocuous]

Completed in #228