## Summary
We are releasing Twenty v2.0. This PR sets up the
upgrade-version-command machinery for the new release line:
- Move `1.23.0` into `TWENTY_PREVIOUS_VERSIONS` (it just shipped)
- Set `TWENTY_CURRENT_VERSION` to `2.0.0` (no specific upgrade commands
— this is just the major version cut)
- Set `TWENTY_NEXT_VERSIONS` to `['2.1.0']` so future PRs that
previously would have targeted `1.24.0` now target `2.1.0`
- Add empty `V2_0_UpgradeVersionCommandModule` and
`V2_1_UpgradeVersionCommandModule` and wire them into
`WorkspaceCommandProviderModule`
- Refresh the `InstanceCommandGenerationService` snapshots to reflect
the new current version (`2.0.0` / `2-0-` slug)
The `2-0/` directory is intentionally empty — there are no specific
upgrade commands for the v2.0 cut. New upgrade commands authored after
this merges should land in `2-1/` (or be generated against `--version
2.1.0`).
## Test plan
- [x] `npx jest` on the impacted upgrade test files
(`upgrade-sequence-reader`, `upgrade-command-registry`,
`instance-command-generation`) passes (41 tests, 8 snapshots)
- [x] `prettier --check` and `oxlint` clean on touched files
- [ ] Manual: open `nx run twenty-server:command -- upgrade --dry-run`
against a local stack with workspaces still on `1.23.0` and confirm the
sequence is computed without errors
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