tui: fix task state filters

[oliver-sanders]

• Closes https://github.com/cylc/cylc-flow/issues/5716
• Families cannot be filtered out in the GraphQL query because we can only filter by state (which is an aggreagate state for families), not state totals (i.e. all task states contained within the family).
• This fixes the approach by filtering out empty familes and cycles client-side.

Test this with any odd workflow that contains families. Before this change task state filtering kinda worked, however, sometimes tasks were erroneously filtered out (due to the family state not matching the task state) and some empty families/cycles were left in erroneously.

Check List

• [x] I have read CONTRIBUTING.md and added my name as a Code Contributor.
• [x] Contains logically grouped changes (else tidy your branch by rebase).
• [x] Does not contain off-topic changes (use other PRs for other changes).
• [x] Applied any dependency changes to both setup.cfg (and conda-environment.yml if present).
• [x] Tests are included (or explain why tests are not needed).
• [x] Changelog entry included if this is a change that can affect users
• [x] Cylc-Doc pull request opened if required at cylc/cylc-doc/pull/XXXX.
• [x] If this is a bug fix, PR should be raised against the relevant ?.?.x branch.

[oliver-sanders]

Mark spotted two issues:

1. Traceback when running the complex workflow (solved).
2. Non-waiting jobs occasionally appearing when filtering for waiting tasks (replicated but not solved). This seems to be a momentary flicker that quickly vanishes.

[oliver-sanders]

I can't get a handle on issue (2). I have only very occasionally seen filtering go wrong and always a quick flash that quickly corrects itself.

Less broken is an improvement.

[wxtim]

Less broken is an improvement.

I'd be happy to accept this PR on that basis? @markgrahamdawson ?