[lib] Enable new id schema

Summary:
Bump state versions, and replace FUTURE_CODE_VERSION. Also remove the flag blocking the conversions, because after migrations had run, the code on the clients should run unconditionally, and the keyserver changes are version gated anyway, so this flag is not needed.

Depends on D8383, D8385

Test Plan: N/A

Reviewers: kamil, tomek

Reviewed By: kamil

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D8386