The headline ParentExecutionIdCorrelationTests intermittently failed under
full-suite parallel load, seeing 6 of 7 routed-run rows (NotifySend missing).
Root cause: WaitForSiteRowsPersistedAsync checked only a row *count*, which a
partial snapshot could satisfy before the last-emitted NotifySend row settled,
letting the SiteAuditTelemetryActor drain a partial batch. Fix is test-only:
wait on the specific audit Kinds (guaranteeing NotifySend is durably in SQLite
before the assertion) and widen the assertion ceiling 30s -> 90s for drain
headroom under load. Also drops leftover // DIAG sampler debug scaffolding.
