Prepare release: 2.14.0

[github-actions]

⚡ Merging this PR will automatically create a GitHub Release & publish the package ⚡

This PR was created by the Release stage 1 - create release PR workflow, triggered by @oliver-sanders

Tests:

• Tests last run on master:
  
• ✔️ Build check passed - see the workflow run (number 41) for more info

Checklist:

• Milestone complete?
  0 other open issues/PRs on milestone 2.14.0 at time of PR creation

Next steps:

• @oliver-sanders should request 1 or 2 reviews
• If any further changes are needed, push to this PR branch
• After merging, the bot will comment below with a link to the release (if not, look at the PR checks tab)

Important

Do not use [skip ci] in commit messages pushed to this PR, as it will prevent the 2nd stage release workflow from running.

[oliver-sanders]

We're cutting a cylc-uiserver release, may as well update the UI at the same time.

[MetRonnie]

Reverted #2540, will re-implement in #2542

[ChrisPaulBennett]

LGTM

[github-actions]

✔️ success

Next steps for @oliver-sanders:

• view/edit the GitHub release description as appropriate
• ✔️ Milestone automatically closed

---

Comment created by workflow: Release stage 2 - auto publish, run: 941

[oliver-sanders]

UIS update PR up: cylc/cylc-uiserver#812