Pub + split query fix

[Clare72]

add empty pub results (not just missing) to regeneration
move pub and split tests to fixture-based for PRs, live for scheduled
increased scheduled test frequency
documentation

[github-actions]

⚠️ 45 test(s) skipped — an upstream data source was unreachable

The full suite ran, but 45 test(s) were skipped because an upstream data source (VFB's Neo4j / SOLR / Owlery, or FlyBase's Chado) did not answer during this run.

These are not failures and not a problem with this branch — but those queries went unverified, so a green check here is an incomplete run.

To re-run: open this workflow run and click Re-run all jobs once the data sources are healthy (re-running the “Run completeness” check itself does nothing — it has no job behind it).

803 passed, 45 skipped, 341 warnings in 883.22s (0:14:43)

_{Posted automatically. This comment is removed once a run completes with zero skips.}