Pre batch processing task state (Option 2)

[dwsutherland]

closes #6567, closes #6860, closes #6861

Note: The following view, will almost never been seen (otherwise TUI would've be crashing all the time previously), and has been generated by commenting out this batch block:

With that said, momentarily the pre batch processed DB would show:

(The WUI should change the ICON to (?) or something appropriate)

description

    TASK_STATUS_UNKNOWN:
        'Job status yet to be determined.'

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).
• 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.

[oliver-sanders]

A stateless task is a data store bug.

It's possible to smooth it over in the UIs, but we should really be fixing the problem at the source.

[oliver-sanders]

Really don't want to go down the route of introducing an "unknown" task state to cover up a bug.

But strangely, I've managed to reproduce the bug on this branch too. Something stranger is at work...

I'll close this to help tidy up open PRs.