add Cylc Review

[wxtim]

Requires cylc/cylc-flow#7068 to work correctly (else cylc review is labelled a dead-end).

Check List

• I have read CONTRIBUTING.md and added my name as a Code Contributor.
• Contains logically grouped changes (else tidy your branch by rebase).
• Does not contain off-topic changes (use other PRs for other changes).
• Applied any dependency changes to both setup.cfg (and conda-environment.yml if present).
• Tests are included (or explain why tests are not needed).

Test working can be demonstrated by adding this to CI.

          pip uninstall cylc-flow -y
          pip install git+https://github.com/wxtim/[email protected]

https://github.com/cylc/cylc-uiserver/actions/runs/19763672460/job/56631293468

• Changelog entry included if this is a change that can affect users
• Cylc-Doc pull request opened if required at cylc/cylc-doc/pull/XXXX.
• If this is a bug fix, PR should be raised against the relevant ?.?.x branch.