add owner@host for SUCCEEDED and FAILED tasks

[wxtim]

These changes close #4516

Fix bug where failed tasks could be polled back to incorrect states on restart.

Requirements 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.
• Manual test instructions added to the ticket. It's horrid./
• Appropriate change log entry included.
• No documentation update required.

[dpmatthews]

Works fine in my test

[wxtim]

I've spent quite a long time trying to test this and am finding it tricky. Can we manually test it, pending me raising other questions about testing Cylc 7?

To test manually at the Met Office use ${TIMSHOME}/cylc-run/bug.polling-restart.

You can either turn this into a new workflow and replicate the whole bug or git clone it (it's a git repo) and do a cylc restart without my change (should show the bug), git reset HEAD --hard and try a cylc restart with the change.

[MetRonnie]

LGTM. I haven't been able to reproduce the issue because I don't think I'm set up for the hosts you gave in your example

[hjoliver]

LGTM 👍

Merging, as @dpmatthews has also tested and confirmed the fix.