snapshotAcrossReplicationStatistics

Appends a completed-snapshot across-replication statistics section.

Unlike live-model and database reports, this function cannot rebuild ksl.utilities.statistic.Statistic instances because the completed snapshot holds finalized aggregate rows, not raw per-replication observations. It therefore renders the stored fields directly. If showDiagnostics is true, a second table displays diagnostic fields that are normally hidden in compact result summaries.